It’s not “common” as in a huge percentage of content gets removed… Most of it is fine. But we do moderate here on Lemmy and Beehaw. The perspective might be a bit skewed because some people are very vocal and complain a lot about stuff getting deleted. Some of the time unwarranted… Most communities don’t tolerate derailing arguments or spreading misinformation… Some of the time the mods also make mistakes or they’re overly strict in their communities, happens a lot in drama things and to some extent in the news and political communities. Other than that, I wouldn’t say it’s a very common thing. But yeah, comments get deleted. It depends a lot on what you engage with, and in which corner of the Fediverse. And some people like to stir up drama, usually less so on Beehaw.