A few years ago, the Lemmy Developers decided to keep their political views on lemmygrad while keeping lemmy.ml more neutral. Now they are banning users who are critical of their actions and bigotry.
Anti-Tankie posts may put you at risk of being banned from commenting and posting on the lemmy.ml instance.
Sums it up seemingly well. The only upsid is that they created a platform they can not control AFAIK. So other instances can do whatever they want.
Give them time, they will eventually self-defederate.