Really 3 big players right now.

https://browse.feddit.de/

Lemmy.ml Lemmy.world Beehaw

Those 3 servers are like currently 70% of Lemmy traffic.

Yeah you have to be careful. I still venture to guess 80% of folks here have no idea how federation works. Over time I hope things get better but federation is not a newbie friendly thing. People have to realize how it works and the more spread out the better.