Specifically for this context, if Musk and Altman conspired to do wrong by someone, it would be much easier to 'quietly beat them with a $5 wrench' than to engineer and construct OpenAI to publicly serve some cold dish. That's not to say it's all warm and fuzzy, but businesses that can succeed on aligned interests are better than those that seek cut throat markets.
While I don't dispute the power of stress and pressure to light a fire under someone's ass, I don't think it should come in the form of a person's livelihood.
For example, it's not hard to imagine founder(s) that have been working for years on something with no pay, putting them far behind their traditionally-employed peers. They may even have family obligations on top of that. Proceeding to then pay them low wages in the interest of motivation isn't exactly the best idea.
Granted, I do tend to agree with the ethos of having the founder being the lowest-paid employee in the company. Ideally that just ensures everyone else is paid really, really well.
I don't like industries that institutionalize the consumption of individuals enthusiasm or altruism. We've essentially lost medicine to the latter and it sucks to see the startup scene consumed by the former.
I think he took on the risk when he bought into it.
But yeah.