I do feel like there’s a correlation between you’d only work there for obscene amounts of money and the culture being so miserable that you’d hate it anyway. To me enduring that sort of situation might be a solid definition of selling out.

There's definitely places like that. Amazon, for instance, seems to run on employee burnout (and the odd workaholic in Bezos image the culture is designed for). But there's also places where they pay you a pretty big sum of money but are reasonable to work at. Most big tech is like this.