lemmy ml is the omni-instance, it's federated with everything except NSFW and a few outright nazi instances which have no right to exist. That's the main reason I set up here, I don't want proto-fascist admins deciding what instances I'm allowed to interact with coughworldcough
At first I was against ml not federating with NSFW instances until I signed up for one, and WOW it's just non stop commercial spam.