Is this always true though? I've worked with a grand total of one company where, if the company went bust, it would mean the end of the founders' life savings. Every other startup/company I've seen, the founder was already very well off. Yes, they put a big chunk of capital and/or time into the start-up. Yes, they were highly motivated to make it succeed. But if it failed, they would... be sad, fall back to family money for a while, and then later do another start-up (or go back to their previous career in Investment Banking). I think this idea that the founder must be singularly taking a huge amount of "risk" is a romantic, stereotypical take, not always true.
Start-up employees, however are shouldering risk. They are by and large not already wealthy so if the start-up fails, there goes their livelihood until they line up another job. I think we should stop thinking that "risk" is exactly the same as "how much of the company's raw dollar equity did you contribute".