There are many topics that aren’t allowed on the main sub (revenge stories, violence, asking for advice, etc.) that would be allowed on aitb.
I’ve seen way more fake posts on other aita subs (r/AITAH, r/TwoHotTakes, etc.), the moderation on r/aita usually catches most obvious rage bait posts.
I had to google that abbreviation and only came up with
Adventures In The Beetroot Field (booking agency; London, UK)
I eventually clicked on the reddit link though, after putting on some rubber gloves and taking a few anti-nausea pills. There i found the right explanation