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At the end of the month, I am switching from Telekom to Vodafone. I don't believe it will get better, it will only be significantly cheaper. Unfortunately, providers treat existing customers worse than new customers. I understand that very well from a business perspective, but it still sucks.

From a commercial perspective, with regular payment flows from an existing customer, it is often significantly cheaper to retain an existing customer than to acquire a new one, let alone reacquire a disgruntled terminating existing customer (Customer Lifetime Value). Unfortunately, many large corporations have not understood this.

Unfortunately, providers treat existing customers worse than new customers. Although I understand that very well from a business perspective,

I only understand it insofar as their controlling does not negatively record the lost existing customers on the scorecard.

Only with a fiber optic connection is the likelihood of oversubscription very low.

You are mistaken. The most widely used GPON in Germany is, by design, already based on oversubscription. Typically, 64 users are connected to one fiber with 2.5 Gbit/s. So not even everyone has to book the 1-Gbit/s-XXL plan for the bandwidth to be rationed.

Usually, 64 participants are connected to a fiber with 2.5 Gbit/s.

That's already quite a lot. The rationing is a dynamic process; in the worst case, each would still have almost 40 Mbit/s computationally. Do you know of any private application that would fully utilize a gigabit line? I currently lack the imagination for that.

It's not about whether you need 1 Gbit/s, but rather whether you technically have a chance to actually receive the majority of the bandwidth you booked and paid for. Apart from that, it is usually the case that with an increasing upstream, the downstream also increases, which can sometimes be "necessary" or at least desired, so that you are forced to choose the faster plan because of that.

Anyway, if I pay for 1 Gbit/s and only get just under 40 Mbit/s during peak hours, then that is quite a severe oversubscription, and that's what I wanted to point out. Even if I only occasionally use the 1 Gbit/s, which is more likely nowadays with increased home office, I am paying precisely for the availability when I need it. However, it remains true that fiber optics overall operate more stably and reliably than, for example, internet over (former) cable TV lines.