I think a large part of it has to do with the fact that young college students and/or recent graduates building startups and hitting it big with VC funding.
It's effectively giving kids that haven't grown up a large sum of money.
Even so, do these VCs not install any kind of adult supervision when they put their money on the line? Sure, they don't want to just bring in their own CEO, but a little bit of guidance along the lines of "this is a fucking workplace, not somewhere for you to play out your immature sexual power fantasies and jeopardise my money" would go a long way.
It's effectively giving kids that haven't grown up a large sum of money.