Land offers from prefabricated house providers

Currently, I can't imagine that prefab house providers really hold that many plots of land for potential customers and therefore assume they are bait offers to be able to arrange an initial consultation.

Yes, that's how it is.

In case of doubt, the plot unfortunately doesn't exist after all?!

Usually yes. These are publicly purchasable plots. The companies advertise their houses with reference to plot x or y

numerous fraudulent ones.

That is exaggerated. Every construction company is allowed to advertise their houses, regionally of course gladly with a plot offer. They basically hang onto that. There is nothing wrong with that, and it does not make them fraudulent. Besides, nowadays there are hardly any fraudulent companies that advertise widely locally. You find those in the small classifieds with three lines. In new development areas, many plots are indeed reserved by financially sound construction companies, yet they are also sold unbound. If you can imagine building with this construction company, nothing stands in the way of calling them. Often new building plots are not even listed, and you could overlook them. They don’t add a portal surcharge or anything like that. Upon contacting the construction company, you enter the company's database. You can ask to be called when a new plot offer is available, but stay away from any contract. That is not necessary and only binds you. That is the only risk involved. You must later pay attention to the contract terms when purchasing a plot and the construction contract to ensure it is not a tied transaction. However, the common nationwide house builders are not necessarily the best or cheapest. So if you search via the triangle, you have a chance at the plot and take on a regional builder.

Mostly yes. These are publicly purchasable plots of land.

Mostly they are not publicly offered plots of land, but only were. Land offers are regularly abused without the knowledge or even consent of private providers. The plots of land are often still used as decoys, even when the seller has long since removed them from the offer. Regularly, the supposed provider has no agreement whatsoever with the original genuine seller, and thus actually has no access to the offered "goods". This is called "fraud" (attempt) under the Criminal Code. However, the fraud is legally completed only when the supposed provider effectively obtains a construction contract this way.

The companies advertise their houses with relation to plot x or y

Typically, the scheme works so that a house from the supposed provider’s portfolio is projected onto an advertised plot without the actual buildability of the plot with this house model having been clarified. Therefore, one cannot speak seriously of a "relation to the plot."

That is exaggerated.

Unfortunately not. The scheme is continuously current.

Every construction company is allowed to advertise their houses, regionally of course gladly with a land offer. They basically attach themselves to it. There is nothing wrong with that, and it does not make them fraudulent. Besides, there are nowadays hardly any fraudulent companies making large local advertisements for themselves globally.

As explained above, the situation is unfortunately completely different. The organizers of the scheme are regularly commission agents formally without (provable) tolerance or even instigation by the company they represent, whose logo they bear.

In the new development area many plots are actually reserved by solvent construction companies, nevertheless they are also sold unbound. [...] At the occasion of contact with the construction company you get into the company’s database. You can have them call you when a new plot offer occurs. But stay away from a contract. That is not necessary and only binds you. That is the only risk involved. One has to pay attention to the contract conditions later when buying a plot and the work contract, so that it does not become a tied transaction.

I already said that not all "land service" offers are "empty sales." If the plots are actually under the control of the construction company, at most the tying to a construction contract speaks against it. And where this does not exist or can be dissolved against a fee, it is also fiscally unproblematic.

Mostly are not publicly offered plots, but were only. Land offers are regularly misused without the knowledge or even consent of the private providers.

Where do you get your assumption from? What is it based on? Example?

Typically the scam works like this: a house from the portfolio of the alleged provider is superimposed onto an advertised plot, without the actual buildability of the plot with this house model being clarified. In this respect, there can be no serious talk of a "connection to the plot."

That is also not correct, as I already said... they advertise regionally with their houses and provide example plots that are still available. The municipality offers these, for example through a bank or directly.

As explained above, the situation is unfortunately completely different. The organizers of the scam are regularly commission agents formally without (provable) tolerance or even instigation on the part of the company they represent, whose logo they display.

How do you always come up with your very nasty allegations? Completely, regularly, . completely regularly unsound. What you are doing is impossible propaganda.
And no, I do not expect any answer to that!

Construction providers often have the problem that they are supposed to invest effort in prospective clients who do not yet have a plot of land. If they supply the plot of land as well, conversations can be conducted more effectively. For many people, this is a welcome reduction in the complexity of "being a builder." To that extent, the basic idea is by no means objectionable. What is "serious" and what is not can only be determined on a case-by-case basis. As in all sectors involving large sums of money, the construction industry also (but not exclusively) attracts a few profiteers who do not take customer friendliness very seriously.

Building providers often have the problem that they are supposed to invest effort in prospective clients who do not yet have land. If they supply the land, conversations can be conducted better. For many people, this is a welcome reduction in the complexity of "being a builder." So far, this is by no means a reprehensible basic idea.

So far, that is more or less symbiotic.

What is "serious" and what is not can only be determined on a case-by-case basis. As in all sectors involving large sums, a few profiteers who are not very customer-friendly also gather in the construction industry (but not only there).

In my opinion, this can be decided quite easily: with some kind of agreement between the "service provider" and the owner, it is serious, and if an offer from an uninvolved party is overstepped without their consent—hence why I call it a "short sale"—then it is unserious. Unfortunately, the latter predominates strongly.
This is probably inseparable from the industry's preference for shady salespeople. Providers with salespeople employed as salaried staff are "constructively" less likely to be noticeable for such shady methods.
Unfortunately, many providers like to work with "stateless fellows" who sold dietary supplements / aloe vera & co yesterday, prefab houses today, and linked life insurance again tomorrow. Typically multi-level marketers, temporarily interested in a more stable income. The belief that "a fixed salary makes salespeople lazy" persists so stubbornly even among many reputable providers that customer acquisition is preferably entrusted to smooth talkers with high turnover.

Unfortunately, many providers like to work with "stateless fellows,"

It does not change the fact that the old man himself is often the stateless fellow, because he has already confused many things and has many words left to distribute.

It is noticeable that many offers from prefabricated house providers exist that advertise plot + the associated house.

These offers on the portals, usually recognizable by several variants of houses from one (prefabricated house) provider in one ad, are possible on several plots, which are currently being marketed and may at most have the status of reservation. This is an agreement between the seller or bank of the new development area and the house provider, because target groups do not dare to take on one without the other. In these ads, the house builders of course advertise themselves, also including plot and financing services. This plot service is then unscrupulous if they make promises that cannot be kept in order to bind the customer. The offers themselves at this stage are serious and should not be distorted and bitterly spoken of as bad, since this is not yet a "plot service." And why not? Because they are not searching. The plots exist and can possibly also be purchased without a prefabricated house or possibly built with another prefabricated house provider who advertises just below.