In your first paragraph you hint at shadowbanning.

You can't even shadowban people at all on Lemmy (as far as I know), while it's a go-to for unethical Reddit moderators; nothing can be done to stop them and most people don't even know it exists.

I was shadowbanned from /r/tampa because I asked them to implement removal reasons (a feature that's existed on Reddit and takes five or ten minutes to set up). That upset /u/md28usmc and he shadowbanned me for it. Asking why I was shadowbanned led to them perma-banning me.