I'm currently saving up to do just that and its like, "I could buy a house with this money" or "I could go on sabbatical with this money", or "I could bet everything on a business that may or may not succeed and potentially lose it all"
And if I do? There is nothing except going back to the tech grind, or homelessness, or another (far less lucrative) career. Unemployment won't help me (which is complete and utter BULLSHIT for the amount of money I've paid into it), and I'd be ineligible for social security due to that previous tech income hanging over my head. There are no, "sorry you failed, here's some money to get back on your feet and try again" grants
It really underscores the reality that most of these founders have rich family or friends to fall back on.