I have seen several [dead] comments in the last week where I haven't been able to figure out why the comment was killed. Is this a case of "three flags from ot

I have seen several [dead] comments in the last week where I haven't been able to figure out why the comment was killed. Is this a case of "three flags from other community members and you're out"? I've really struggled to figure out why these innocuous-looking comments were killed.