I think there are some kiwis that have a better idea of what Mike Lazzo is like than I do, why adult swim does what it does is a complete mystery to me. My guess is that it's a loosely run ship that will do whatever it wants until Turner steps in to tell them to shape up.
And after a cursory google search. It seems like I may be right.
Basically I think Lazzo could care less, but the show got the attention of higher ups (either because of delays driving up production costs, or a source of sweet merch monies.) and now you have a belligerent head writer/co creator and a network who is tired of bullshit.
Edit: To clarify when I say higher ups I'm referring to Turner or CN execs or whoever goes over adult swim.
Edit 2 autistic boogaloo: Merch sales were a huge motivator for a long time for justifying the continued existence of a cartoon show. In recent memory I can't really think of any show that AS made that had so much merch interest. It depends on the contracts and the leverage a creator has, but from what I understand is that merch sales mostly go to the networks and the creators might not get anything at all from it. Adult swim is probably left to it's own devices until something like this pops up and then the bigwigs start actually taking notice.