I had noticed that the Buffyverse was allowed in; I hadn't noticed any other oddities. Different familiarities! I'd thought that I'd picked up that the mod intended the guideline to be what each fandom generally considers its genuine canon, not what the creators say... but that may well have been my own wishful thinking.

I am still considering playing, given the news that rarelywritten apparently won't be happening this year. But PJ makes an excellent point about owing other projects.