I would guess it comes down to that the best researchers in the world want their work out in the open
Ilya doesn't. He's a strong proponent of closed source and censorship.
He is just one person. He happens to be the most famous scientist working on this field at the moment it became a gold rush, but it's work built on the shoulders of those who came before, whose discoveries are just as important.
Let's hope Totally Safe Intelligence doesn't end up having the same relationship with their name as Totally Open AI.