It really isn't the largest though, maybe by users but certainly not by activity. For example the post about "The Boy and Heron" winning a golden globe got 9 comments on the unspeakable instance and only 2 here. From my own experience posting to both that seems to be the norm.

Regarding content removal from what I saw in the modlog the most concerning action other than preventing people from talking about alternatives was removing the Alya-san Key Visuals. So that gives you a good baseline of what will get hammered if noticed: pretty much everything.

The defederation being grounds for removal of all mention is a bit silly but not a discussion I'm willing to go into here as it would be pretty off-topic. I repsect your opinion on the matter but imo it's a very slippery slope to ban talking about something outright.

To be pretty blunt here closing down here is more a formality than anything really, even just stat wise there are slightly more active users on the other instance and the users there are apparently a lot more engaged in discussion than people here.