My issue with... one of those communities, don't remember which- was that they liked to give "content warnings" for posts... Without ever talking to the OP about them- they'd let you know they were linking, not mention they were adding a content warning, and never respond if you asked them what the content warning was about. I got a warning for ableism, I think it was, on one post, and I don't think I ever figured out what the hell they thought was ableist- it wasn't a post of disability particularly. But bam, according to them I was ableist now, and everyone coming to my blog through that link was expecting me to be, and it really skewed the discussion.