Few actually make it and most who try and fail are pretty miserable later on.
The daily grind is also miserable, but it's a predictable misery.
I do side gigs occasionally and if I were to live off this, I would fail - first and foremost because until recently I was too afraid to charge people amounts that make it worth it for me.
The saying "a bird in the hand is worth two in the bush" seems reasonable at first glance, but it could also be something someone tells you to prevent you from seeking a better place beyond his influence.
Joining a larger entity insulates you from most of these directions and ways of trouble, well until the higher levels.
I'd say it entirely depends on industry, if it allows you to buy a bunch of expensive machinery that makes work of worker more efficient - solo craftsman can't afford and don't have volume to pay for say fancy CNC router - sure it can.
But on the other end, like programming, generally the bigger company is the more levels of indirection and waste happens, and small team can vastly outpace in per-developer productivity a big team.
Now when that team needs to buy 10 million worth of hardware to train their AI stuff that flips back to "corporate with bigger resources enhance productivity
Choice.
They don't have a choice about getting up and going through the M-F slog. They have to so that they can afford to live.
For personal projects, people have choice and can weigh in all of the other things their lives need. Including recovery time from the M-F slog. Their contributions to personal projects are not coerced.