You're misunderstanding. There's nothing wrong with risk and adventure but there is very much wrong with investing everything you own. Just as it's unwise to invest that much in Bitcoin, it's unwise to invest that much in your startup.

So... by that logic, risk and adventure is great, as long as the risk is not actually risky for you as an individual. Which rules out any meaningful risk whatsoever for 95% of americans.

Yes indeed. That doesn't mean my logic is wrong, it in fact means it's consistent with reality!