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The upvoting/downvoting and the per-user blocking are both interesting ideas that I think should be considered, though I don't know how high the technical "cost" would be for implementing them.

But I completely disagree that "no comment should ever be removed, that is nothing more than cancel culture." Personally I'd want less comments removed than currently are -- for example I like the wignutty ones that seem written by outsiders -- but there are definitely good reasons to remove comments, for example comments that doxx people.