My first forum I belonged to turned into a dictatorship. I got banned when I made a political argument in the "everything goes" section that the admin didn't like. He had already soured on me but was just looking for a reason to ban me. One of his friends in the real world that was a part of the forum left after he did that to me.
That's BS. It's no fun at all when people like that are in charge.
I've only been banned from one forum. It's a company that unfortunately nailed a license to make statues of some very beloved characters, but their quality control and packaging suck so bad you're basically playing Russian Roulette with a loaded gun if you order any of their products.
After getting my third flawed statue in a row I snapped and demanded they stop cheating their customers. The reason for the Mod banning me was that I "had an ax to grind". THESE STATUES COST HUNDREDS OF DOLLARS. OF COURSE I'M FUCKING PISSED THAT I'M GETTING RIPPED OFF.
...And then he made a rant about he's sad how everyone hates him and something about his autism. Great person they picked as a Mod. At least word is spreading and people are realizing you don't want to buy from these folks.