How much of this is due to venture capital? Like, if it were possible to make a billion dollars by investing in 100 plumbing companies even if 99 of them turn out to have been dumb, would plumbers make $250K out of college?
One can think of VC's as shooting canons full of money into the weeds and hoping they nail a unicorn.
Less flippantly VC funded companies succeed not because they hire more competent people but because they are vastly better funded than more normal competition.