... for no other reason than that they are mine, or so it seems. I must have offended them. This makes it pointless to go on contributing, so if it's actually a technical problem, please let me know.
You have one answer, no questions and 215 comments. Comments are ephemeral and should be used primarily to ask authors for clarification of their posts. If you would like an answer to stick around, type in the answer box where your contributions can be properly scored and discussed by the community, and where you can update them based on that feedback.
Yours are not the only comments that have been removed. In 2018 moderators removed about 11k comments and the community over 6K. Other sites may be more lenient about comments, but they don’t have the same challenges that we do.
See this discussion for more detail : Comments are constantly disappearing
The entire discussion is worth reading, but I’ll repeat part of one of my comments from that discussion that seems relevant:
I know if you look at it from the perspective of an individual user, the comment policy seems harsh. If you look at it from the perspective of what is good for the site, it makes more sense. Information left in comments is pretty much useless from a site perspective. That content isn’t easily searchable, so it doesn’t help anyone who doesn’t stumble across it. It also prevents some people who may have also thought the same thing from including it in an answer where it belongs because they don’t want to “steal” it from whoever posted it first.
To add a brief addendum to CollenV's answer: If you choose to comment, rather than answer, then the comment is either not serious or mostly irrelevant. Or, conversely, if you really think your comment was important enough to retain, then you should have put it into an answer.
Of course, this also means you have to substantiate what you say, and expose it to public vote. You have to weigh the options.