I'm not sure on that, but there are plenty of others who Adult Swim have fucked over in the past. One of the most notable examples is C. Martin Croker, animator and voice of Zorak and Moltar (and other early Adult Swim characters). Despite being one of the people who helped to build Adult Swim from the ground up, he was pretty much cast aside in the mid 00's, barely given even token work for years. The tributes to him after his death ring hollow in that light.
You've also got Dino Stamatopolous; the higher-ups wanted a darker season 3 for Moral Orel, and when they got exactly what they asked for, they cut down their order by multiple episodes and canceled any future seasons, preventing Dino from fully exploring the concepts he wanted to. Brendan Small got fucked over with Metalocalypse's final season, leaving its story unresolved almost a decade later; never mind that they produced the highest-selling death metal albms of all time, it still got the axe. And of course, we have the most recent example with the cancellation of The Venture Bros. for no discernible reason other than new management unable to see the value in it despite its often glacial production schedule. And that's without getting into the whole Sam Hyde thing.
I guess this is pretty off-topic at this point, but to bring it back to Blobbo's "burn," modern Adult Swim is not the sort of place that would greenlight a show from the Mayo Ghouls anymore, if it ever was. If you have the right ideology (and often the right skin color too), it doesn't matter how shit your idea is, you're golden. Look at the abomination that is Lazor Wulf to see my point.