Who would “ban” Lemmy.ml? There isn’t a “master instance” over all, each instance is an island.
Lemmy.world is currently discussing whether or not to sever ties with Lemmy.ml, just like Literature.cafe alreay did.
Lemmy.world has already defederated from Lemmygrad and Hexbear, the 2 largest Marxist instances, so Lemmy.ml is the last major Marxist-friendly instance that Lemmy.world interacts with.
For clarity, Lemmy.ml is seen very positively by some servers, and negatively by others. You are getting viewpoints largely from Lemmy.world, whereas other communities like db0, Hexbear, Lemmygrad, Blahaj.zone, or otherwise may have different or opposite stances.