What if you want to do something expensive, like design a new fusion power plant? That can’t make money in a few years. There’s many types of businesses that need investment to get rolling.
You might as well work at an existing business rather than waste investors money when you know it's an expensive endeavor and you know there is no route for investors to get their money back.
Especially in this market where money isn't cheap anymore, not everything is investable.
A double negative.
But say you want to make a new gadget, yeah you would find it hard to bootstrap unless you are already a multimillion dollar company.