It is hard for me to square "This company is a few short years away from building world-changing AGI" and "I'm stepping away to do my own thing". Maybe I'm just bad at putting myself in someone else's shoes, but I feel like if I had spent years working towards a vision of AGI, and thought that success was finally just around the corner, it'd be very difficult to walk away.
My take is that Altman recognizes LLM winter is coming and is trying to entrench.
They just won’t be the hottest thing since smartphones.