Your contributions may have been banned by specific subs for being off-topic.

SaidIt is a free speech site for the most part, but it does allow subs to be community/subject-focused and not allow alternate or questioning/debating opinions. Those subs must state in their sidebar that they are not open for debate and/or censor alternate opinions, and must remove themselves from s/all.

So, some subs you will not be allowed to learn by asking questions. They don't want that, so you can only observe what they believe and learn as a watcher.

You, as a user, need to read the sidebar explanation of wherever you post.