If you don't have the track record or wealth to justify that then yea it is a massive red signal.
Imo, a CEO/CTO in the Bay Area should pay themselves market rate for their equivalent PM/Staff Eng position.
Some will take a very low salary ($70-90k) but they are also younger (early-mid 20s), but going up to $150-70k is doable depending on life circumstances (tbf, a founder with a family also probably has a decade+ of experience so I'd trust them more).
The level of confidence you gain after years of doing this lets you take the risk without worrying about the money. I've never let my family be in a position to be at risk, why would that change now?