Sam is backed by investors who are looking for returns, and are not sure if Ilya will get them the same juicy 100X.
So, if Sam comes back, then I’m pretty sure Ilya will go on his own. Whether he will focus on GPT or AGI or ?, is anyone’s guess, as is how many from OpenAI will follow him as everyone loves money.
EDIT: Ilya should have no trouble finding benefactors of his own, whether they are one of the FAANGs or VCs is TBD.
Investment is only partially about trust. I agree Sam's a pretty investable guy. I expect Sam to pursue growth through fundraising, product commercialization, corporate partnerships, etc in exactly the YC mode. He's also clearly ok with letting the momentum of that growth overwhelm the original stated aims of OpenAI, especially given what the original firing press release said about Sam not being entirely forthright. I suspect Microsoft made their investment knowing that something like this might happen. It's not trustworthy that he tried to overwhelm nonprofit aims under for-profit momentum, but if you're an investor do you care?