I had similar experiences, and couldn't understand why they would discourage dialog and discussion around various issues. The thing is, they don't actually want dialog, they want to stamp out opposition to their views as though it never existed.

You probably commented on one of the verboten subreddits. That's how I got most of my bans.

I vowed to be done with it when it became subscription based, and now here I am. Kind of glad actually, been looking for an excuse for years as the site became more and more stale, unoriginal, and politics began to overwhelm everything. Maybe this is just how it has to be every decade or so.