FWIW I built browsers from 1999 for a long time. (But I was never a wunderkind, just somewhat tenaciously curious).
And I guess I am doing fine, but not amazingly rich or so.
Browsers were always a project closer to research/charity. I think Marc Andreessen said something similar - that he would never do that again. B2B is where you can make money.
You don't need your impressive product to succeed to land a good career.
If Alice is doing LLM-from-scratch work today, and Bob is doing agent harness work today, Bob's project is far more likely than Alice's to become useful/popular/profitable.
But if neither project survives, in 5 years, Alice will be more employable/at a higher market rate than Bob.