This is good for the world. Hyper concentration of talent reduces diversity.
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Silicon Valley, the population of ordinary people residing there, 10 years ago (2015), heaved diversity. In corporate employment, it took decades to break through gender and race ceilings in industry to various degrees, but it largely happened, mostly, for better or worse.
Bringing together people, capital, opportunity, and academia creates a vibrant ecosystem that mutually reinforces further gains in a "virtuous" cycle. What doesn't create much is having only a few people spread out without a support system. It takes encouraging a mix of many open minded people within a smaller physical or digital proximity in order to get the w00w00 effect. That can't really happen when people are told they're not welcome.