The reason behind their ban tends to be banal, as it typically aligns with what you would expect: Vaccine denialism, and so on, almost always intruding into an unrelated discussion.

The effectiveness of proper moderation is what largely keeps it from catching your attention.

The implication that anybody who's been banned from a subreddit is probably an antivaxxer or some other form of cretin, cute. In reality, reddit has automod bots mass banning countless thousands of accounts without consideration for their position, simply because of where they said a thing and not the thing that was said. And you can even catch bans for criticizing this because the mods employ the same pattern you have; anybody criticizing their capricious moderation must surely be a terrible cretin!

Would you like to give an actual example of a subreddit you're banned from because you were posting in some other subreddit? Or evidence that that's happening to the average reddit user?

I certainly believe it happens, but the times I've heard it come up was generally because of brigading and harassment from one subreddit towards another, which certainly sweeps up some folks who just happened to be posting on both, but feels reasonable enough, situation depending.

Ah I see rarely is it the case that they uttered regrettable or abhorrent remarks; the outcome always stems from either a conspiracy or an authoritarian moderator reveling in their power.

Are the automod bots a conspiracy? Conspiracy.. that's a new word that means any crazy obviously false theory right? If I insinuate that somebody is a conspiracy theorist, that proves they are wrong of course.

You should definitely continue yelling into the void about this.

Reverse psychology, that's a neat trick.