He’s just another billionaire. Probably just not the typical sociopathic ones or a narcissist.
Once he had enough money for everything he could ever need he could have devoted himself to building a self sufficient non-capitalist future for valve/steam with irrevocable covenants in its governance that are not manipulated by the next sociopath to take leadership of the company, like Altman is doing with OpenAI.
Point being, he might not be a sociopath like the majority of them, and he doesn’t seem to be evil, but he’s not a saint either.
There’s also the platforms moderation issues with shitloads of bigotry. Feels like a blind eye but maybe it’s just me. They could take a spare billion in profits, throw it into low risks stocks with dividends or bonds, and pay a team to moderate it out of that in perpetuity without affecting his business or his life like how college endowments work. That is unless the goal for him is still more billions.