Fiber optics must be laid according to law wherever new construction takes place or the ground is torn up, yes.
No. Empty conduits must be laid. In new development areas, fiber optics as a broadband medium are mandatory; I mentioned the source.
But as it always is. Being right and getting justice are two different things, because in court and at sea you are in God's hands.
I miss the connection to the topic here. Is that your version of "oh yeah, true, my statement was wrong, sorry"?
Of course you have to keep at it, but if the network operator ghosts you... what else can you do? Except get something with 5G, even if you can no longer game as well.
But there are probably worse things in the world than that.
The development contractor was chosen by someone. Probably the municipality. They have different contacts to the provider; I would try through them. If necessary, you can also unite with other affected parties. Contacting the local press can also be helpful.
Without (real) broadband, I wouldn’t build or rent an apartment in place X today. Much more important than, for example, a highway connection.
By the way, 5G often has less bandwidth than LTE in many places, but possibly better latency. But that is all just Plan B.
You can be glad if you have Edge, for calling.
WLAN calling as a tariff feature is the savior :)