Telekom has approx. 40% market of broadband in Germany, so many Telekom users from Germany maybe as expected?
[added later:] It is really Telekom dependent, see my SOLVED FOR ME post in this thread and
https://forums.flightsimulator.com/t/low-bandwidth-issues-with-telekom-germany-only/676048
[edited: added “in Germany” and “from Germany”]