The basis is spending 15 years in NYC high finance and having multiple close groups of friends who graduated from Stanford, work in tech, raised VC, etc
Perhaps we should focus on drawing more actual talent rather than excluding the phonies (even at the highest levels, status and influence isn’t zero sum in my experience).
Ultimately, I think the "phonies" need to be addressed directly because I believe they are effectively a cabal.
I also think it requires the broader culture to take active steps to help make this happen: work harder to think about what bad behavior is and take action to avoid / penalize it.
FWIW, I have traveled in the finance / startup circles and kept looking for "better places" but have come to the conclusion that they are few and far between and the issue is the business culture and the broader culture that celebrates it.