Perhaps I'm just a naive young imbecile.

Even with such a golden ticket ride to the heavens? You could do anything, focus on your family and build your little castle or depersonalize even, change countries, change your identity, make new connections, live a completely different life...

I don't think you're an imbecile. People just like living differently. "Work to live" vs "live to work" and all that.

Some people like working a stable but boring 9-5. Some people like working a challenging job, even for longer hours and lower pay. Some people like building things; some people like coordinating teams and managing people; some people like maximizing financial returns and seeing numbers go up.

As to why this specific person didn't take a 9-figure cashout (assuming it's true); I would imagine it's at least partly because this person thinks it could be worth more in the future. Crazy as it sounds, he may not be wrong. Remember that Larry and Sergey tried to sell their "Google" research project to Yahoo for a life-changing amount of $1 million (in 1998, they could have each bought a house!). Or a million-dollar sale that did happen, Roy Raymond selling Victoria's Secret for a million in 1982. (Multiple houses!)

Obviously 9 figures is a lot different than 7, especially in 2025. But he's also the CTO and has access to financials and company strategy. Who's to say that the $100,000,000 he would get won't be $250,000,000 in an acquisition next year? Even "just" a 25% bump in a year would be an extra $25 million, which in itself is life-changing. It's obviously a risk, but saying "this guy is crazy and/or an idiot for not taking a 9 figure cashout" isn't fair unless you can peer into the future.