I'm sure there are plenty of bad ones. But I haven't participated in groups where those have been a problem.

I was banned from all field-recording-related subs because I asked a question about microphones, and the lack of a particular kind in the market. More people piled in, and eventually we contacted the CEO of a mic company who engaged with us and said he'd make a modified version of a product if enough people expressed interest.

Everyone involved with the thread was banned and it was deleted, with no excuse. I never raised the topic again, but was immediately banned from another recording-related sub when I answered a question about a recorder... as if my account had been flagged by some inbred cabal to auto-ban if I ever showed up.

This behavior utterly defeated the purpose of the forums and stole from users. Yes, stole. It's time that people took stock of the fact that the time we spend to compose questions and answers on forums is not free, and those who deliberately steal it should be called out every time.

Just wait until you've been banned on sub's you've never visited before - because you made a comment somewhere else on reddit.

Mods can be great, and many of them are. But... there's plenty of bad ones out there that make participating in some communities stifling at best.

That is one of the exact things I'm talking about. Mass banning from subs you don't even participate in, or that could not have been related to whatever you're being persecuted for.