I thought they didn't have my stuff on here because I was using the alphabetised list search but using the search box, they have 28 of my fics on the site. With great sadness because I know a lot of people read on AO3 without accounts, I'm going to have to do as suggested and lock everything to registered users.
I've submitted a DMCA - although whether they adhere to it or not I don't know considering they are brazen enough to have the Harry Potter books on here.
Attention AO3 WRITERS!
Your fiction has most likely been stolen, repackaged, and is being sold as e-books on Ebooks Tree. Please go and 'search' for your fic (in the search box, the alphabetized list doesn't show you everything!), and then
go here for more info/ to find out how to get it removed.
ETA: It's pretty funny that they've even got a podfic announcement entry on there!