I am not sure why YC should get the opportunity to get 100 entrepreneurs get startup visas. Why not open the level playing field and allow ANY entrepreneur to

I am not sure why YC should get the opportunity to get 100 entrepreneurs get startup visas. Why not open the level playing field and allow ANY entrepreneur to get such a visa? There are plenty of Dropbox / Airbnb companies that are getting built, going public or getting sold outside of YC.