They raised VC capital, they have to get acquired by an AI lab.
Also, Ryan Dahl is a rare talent.
He has already done a Google Brain Residency so it makes sense for him to go to OpenAI or another AI lab for developing AI agents.
I would also understand if Deno gets acquired by Vercel, but Ryan might be tired on working on JS/TS, he may want to move on and work on AI agents.