Ilya himself said he's against fully open source models because they're not safe enough. He's definitely against open source, my hunch is that we will see OpenAI being
less open after his takeover.
Full interview here ("No Priors Ep. 39 | With OpenAI Co-Founder & Chief Scientist Ilya Sutskever" from 2 weeks ago): https://www.youtube.com/watch?v=Ft0gTO2K85A