The only way to justify trillion dollar valuations is to sell cruelty-free robot slaves which replace white collar labor for pennies on the dollar.
Even though it's a complete and total sham, there's no American agency willing to or capable of prosecuting these firms for fraud, so they really have very strong incentives to keep up the lie.
Also possible if you make god
Saying you want to make workers more productive and provide better tools for people just isn't that sexy.