https://medium.com/@kazeemibrahim18/the-post-ipo-performance...
> In aggregate, the average return across these YC companies is -49%, with a median return of -46%. To put this into perspective, over the same period, the S&P 500 yielded a positive return of 58%
And for the rest of the companies, they aren’t trying to compete with BigTech, they are trying to get acquired by them. Out of the literally thousands of companies that YC has invested in, only about two dozen have gone public