This instance (lemmy.ml) is one that still federates with lemmygrad, last I noticed. Even then, although the number of unhinged tankies I see here is non-zero, it still isn’t large. (In fact, it’s mainly one particular user that stands out. Y-something, with a name using a bunch of stylized high-unicode characters.)

When I’m on lemmy.world, which I think has defederated from lemmygrad, I pretty much don’t see them at all.

Frankly, I don’t think they’re bothering to try to insert themselves in lemmy.world.