Other wikis of shows that have a leak history (ie, Adventure Time) have some coverage of leaks after the fact, even if they ban discussion of leaks as they occur. As there will never be another Steven Universe leak, the original issue with leaks--people posting spoilers that were not supposed to get out yet to the distress of the crew--no longer exists.

For Steven Universe, leaks were so prevalent and such a huge deal that it's difficult not to aknowledge them--a few pages actually make mention of them already where relevant. I think that a page about their history would be a good record to have, and it would also make an interesting meta / trivia page, much like the page covering censorship in other countries.