Note, by the way, that the MPC hasn't even been actively searching for infringements. They're being reported to us by individual people not connected to WSFS in any official way, but (for example) people who have run across such a claim that a given individual is a "Hugo Award winning author" on their professional (i.e. pay me money for the words I've written) social media/websites, and they've come to TheHugoAwards.org trying to figure out what it was they actually won.
If you're a member of AO3's community, I suggest you try to persuade your fellow members that making commercial use of AO3's win to claim individual and personal ownership of a Hugo Award win is not a good thing. I'm not talking about silly jokes here. I'm talking about people chipping away at the Hugo Award one real, commercial, professional infringement at a time.