Did you not understand what YC was? They're essentially an investment bank that doesn't accept new clients. They make money, they're not a charity. Quality only matters insofar as it drives sales and doesn't create liabilities.
Unfortunately, that's not how someone gets that third comma in their net worth. The billionaires that so much of American society worship didn't make all of that money by being smart, kind, honest, or ethical. They made it by being dishonest, morally flexible, and ruthless.
Especially now, business ethics are for the "little people." The modern billionaire class no longer cares about even keeping up the appearance of decency.
"The overall goal of YC is to help startups really take off. They arrive at YC at all different stages. Some haven’t even started working yet, and others have been launched for a year or more. But whatever stage a startup is at when they arrive, our goal is to help them to be in dramatically better shape 3 months later."
The exchange the cache of their brand and access to their network + 50k and the company gives up 20% equity. That doesn’t sound too dissimilar from any other VC - their incentives are only loosely aligned to their portfolio companies.