I've only been to their fourms a few times (no account for obvious reasons). The otherkin to not-otherkin ratio over there is quite high compared to other places, I must say.
Truth be told I don't know exactly why RP is banned, it's probably because it would be an absolute pain to moderate on a forum of this size (we're also PG-13 and we'll inevitably get people who want to do stuff that is not PG-13). I wasn't on staff when that rule was put into place. XD