There is a block relay list on amethyst

Tbh, writing your relay block list gets quite difficult when your typing is interrupted a growing list of auth requests fron relays through amber. The option around that seems to auto auth from any relay that requests, but that feels very anti-pattern.

Yeah, I don't have a good way out of it yet. I started authing with random keys (so that relays actually send something), but it also goes against what the relay protocol wants us to do ..

That's a good idea for privacy. Only use real keys for auth when it's in your configured relay list