Yeah the DMCA speculation is ridiculous and would not be why a dev would suddenly stop saying anything. I doubt it has anything to do with a lawsuit, especially considering how Rick and Morty itself was started from a parody of Back to the Future with Marty sucking doc's balls. It would be super hypocritical of AS and they probably just don't give a shit in the slightest.
This is definitely something to do with IRL problems, but to what extent, no one knows for sure. We could all sit here and circle jerk ideas on how ferdafs scammed 20 bajillion dollars from patrons or how they died of ball fracture or what ever, it's not going to do any good for anyone. Best we can all hope for is a response of any kind, but it is seeming unlikely at this point that anything is going to happen.
In the meantime, we can all just support someone who is actually trying.