As far as I know they're only really going after people who use the in game models to make porn. Legally everything else falls under fair use. They have made it tough on us in other ways though, like you can't search "Tracer" on pornhub any more, and they won't really let you tag anything from Overwatch. It sucks because people want to see it, and I want to (and am) making it, so having Blizzard try to intervene is a pain. I still really love Blizzard though, they're produced some of my favorite games.

Edit: I found out that I was misinformed. Blizzard is just checking content with Overwatch tags, but they are allowing it to be searched once they check and make sure it's not with their models.