Everything eventually goes to shit once a company goes public.
In the beginning, it was about some kickass product/service. The focus is on making something good, offering a good service.
Once a company goes public, the all-consuming reason for existence changes. Now it's no longer about the good product/service. It's only about increasing value for shareholders.
This begets mergers and acquisitions, which begets mass layoffs. (Where CEO gets more fat pockets than he had already, shareholders get a little more than a pittance, and hundreds if not thousands of employees get the shaft.)
Why not bootstrap, and get money the old-fashioned way, by working your ass off? You know, building something YOU control, and that you're not beholden to shareholders for?
Build something to last instead of looking for an exit?
I left my last job of 8.5 years, the longest I've ever been at any one job, to go out on my own. Sure, it's a risk.
My employer was in the process of an acquisition, and it completed after I left. Then articles said they were planning on laying off 10% of staff. It's hit 20% now, and no end in sight.