That sentence of yours I quoted above is a solid red flag for me. Your reply now barely answers the "how" question. You didn't bother answering the "where" one. Because there are communities that have rules to avoid politics all together or to stay on topic. So proselytising about the corrupt system or terrible companies even in the most polite terms in a community that focuses, say, on cute bunny pictures will naturally get the moderators going. Another possibility is still that you haven't quite expressed your opinions in the innocuous way you think you have when moderators have stepped in in the past.

Also consider that a lot of the instances that don't do any or very little moderation tend to be isolated. By which I mean other instances won't federate with them.

Of the big instances, Lenmy dot ml has a reputation for being moderated in a biased way. So maybe stay away from there. And read the community rules before you post.