For the record, it appears Otto Maddox has gone into retirement following an accident that crippled his drawing hand and a crisis in his family, according to people who messaged him on pixiv before he took down all the sites with his work featured.
Base +6, Deep in +5, coldsnap19 +6, LEOEATER +7, laptopsuc +7, RichKWL +7, Crash and Burn +6, zeroyuy +4
It took me a while to remember the username I knew them by, this is plumptopia right? or was that his site name? I didn't follow their work closely enough to ever hear "Otto Maddox", sad that they've stopped but I wish the best for them.
Hopefully this means that we can now start collecting his works. Technically his stuff is on the blacklist, and has been for awhile, but several pieces can still be found if you search expunged or if you go looking on e-hentai. He was put on the blacklist because he was actively making content and selling it, but if he's officially dead, then his stuff should be fair game.
Hopefully people who have rips or copies of some of his stories will come forwards and post them.
And yes, @clin, but his stuff is also Plumptopia. He's also posted works under the moniker "jag27".