Well if you use Tor somewhat regularly and check your exit node IP, it is about 50% possible that yours is in that subnet each time you renew the route. Which begs questions.
Maybe I'm wrong, but it would look more benign to have exit nodes distributed without this much bias towards that particular subnet.
It's only 185.220.100 [0] and 185.220.101 [1] that contain all those relays. Some of the bigger German families work together as "Stiftung Erneuerbare Freiheit" that's why you see a big cluster there. But Tor never uses relays in the same /16 for a circuit so it's not really an issue.
[0] https://metrics.torproject.org/rs.html#search/185.220.100 [1] https://metrics.torproject.org/rs.html#search/185.220.101
Correct. "Stiftung Erneuerbare Freiheit" acts as LIR in charge of the address space, handing out chunks of that space to exit relay operating non-profits for free, but does not operate any Tor infrastructure themselves and has no visibility into the traffic. The cost for us are the RIPE membership fees (approx 2000€/yr).
Source: I'm its director and founder of torservers.net. Usually using a different nick here.