You'd think so, but they're banning any new sub that attempts to be a "new" /r/fatpeoplehate -- if it's not about "banning ideas", but "banning behaviour", then I find that somewhat at odds. I think there's a simpler answer: FPH ended up on the front-page of /r/all constantly, and the Imgur staff "doxxing" (I've heard right before they were banned there was something happening regarding harassing the imgur editors outside of Reddit, though I don't know how true it is) was enough to get the admins to pull the plug.

If you're monetising a website, and the most active and fasting growing sub on your website (aside from the defaults) is a subreddit dedicated to mocking fat people, I think that may make it a difficult sell.