Earlier quoted context omitted.
Is there any data on the success rate of companies that aim small? A lot of the allure of the startup is a chance to strike it big. If one isn't doing that anyways, might make more sense to join a big company since they offer a considerably higher expected return on your work. (Also if one can get funding, it lets one get paid an actual salary more quickly.)
I have no clue, it seems uncommon in software, but personally I'd choose working 3 hours a day over 200k/yr any day. IMO having a small team constraint is powerful too, you really have to optimize things otherwise you're screwed. Basically the opposite of a startup, where you'd toss money at the problem while you try and attract more people, making the product increasingly brittle.
A business that you own and which makes you any money on 3 hours a day may be even more rare than a unicorn. In most cases you'll be spending those 3 hours per day on administrative stuff alone.