Most can even file for personal bankruptcy and then lounge around in their parent's home for a bit. (Or a house in the name of their spouse-with-a-prenup.) My parents didn't have a garage for me to found a business in.

When people helpfully suggest, why don't you start your own business, they usually have a substantially bigger than average support network and liquidity to begin with. I never get those suggestions from people who've actually experienced hardship due to job loss or financial stress.