Reddit's CEO was a mod of a jailbait subreddit in the early days - the problem here is that it's impossible to prove whether he joined by himself or whether other mods have added him without his knowledge. As a mod you can add other users as mods and they don't need to agree to it.
He could have removed himself, he’s not a random user but the CEO. I feel like that kinda removes the argument of ‘someone could have added him without his consent’.
That implies he was even aware that it happened, and again, we have no way of knowing that. If someone makes you a mod all that used to happen was that you get a message in your inbox, and he must receive thousands of messages all the time as he's being tagged in things non stop. Also he was literally a mod on thousands of subreddits, unlikely he added himself to all of them, or that he even reviewed the list.
Not for a long time. I believe that it used to be possible (it actually is on Lemmy, though you need to have posted there first), but nowadays on reddit, it sends a mod request.
It happened when it didn't ask for permission. He could've removed himself (and I suppose he eventually did) but I imagine that, as a joke, he was probably added as mod to thousands of subs, and couldn't be arsed to remove himself from all of them.
Yeah the mod thing is baseless. However I do think letting pedophiles hang out on your website doing pedophile stuff without taking an action about it is maybe immoral. I also think allowing white supremacists or other bigots to hang out and spread bigotry is immoral.