I just want to say the maintainer who wrote that appears to have handled this gracefully. It gives me hope.
They've made a transparent public announcement, making it clear what we should and shouldn't expect from them, and how we should handle it. They understand the FOSS paradigm (no, I correct myself, the digital paradigm) and have given their blessings for the community to do what they do best. I'd guess the smart thing to do is play along with the cease notice to avoid consequences, go underground and make YouTube play whack-a-mole with sock-puppets and hostile jurisdictions.
Cut off one head and three shall take its place. Wind in your back lads, wherever you go.