Okay, so I wasn't signed in at all but as I was looking at the news page, there was an image of a dumb-looking bulbasaur that said POKAS or something, and it linked to projectwonderful. I'm just wondering if that was supposed to be a thing, or if my browser got hijacked.

It's an advertisement.

edit: we've been giving feedback about the bad placement of it here :) https://subeta.net/forums.php/read/859933/Intrusive-ad-on-sidebar-and-a-Spanish-ad

Okay, thanks. Posted in that thread, while I was at it. Good to know my browser wasn't hijacked.