[0] https://www.wbur.org/news/2022/05/09/immigrants-are-80-more-...
[1] https://hbr.org/2021/08/research-why-immigrants-are-more-lik...
I had zero success in entrepreneurship in my 20s and I was delusional to think I could accomplish anything in entrepreneurship without both of those properties (and I tried multiple times a year for the decade of my 20s). It would take someone truly amazing* to pull off starting a successful business while working a full-time job.
* And I say that in contrast to myself, who has been called talented more than a few times by my managers and still couldn't pull it off until I earned enough money to take time off
I do agree with the original point. Nowadays, most STEM PhD students at top US schools are immigrants. When I look at the work, delayed gratification, etc, native Americans forgoing a STEM PhD seems a rather rational choice. Starting a company feels like a similar decision.. a lot of pain for statistically low gain.