Very tight NDAs (that they actually litigate) coupled with enforceable non-competes ("garden leave" where they pay your salary for, say, a year as part of the d

Very tight NDAs (that they actually litigate) coupled with enforceable non-competes ("garden leave" where they pay your salary for, say, a year as part of the deal before you can leave for a competitor) is part of it. Really high comp is another. Perhaps a bigger deal is the fact that they actively return money over the roughly $10BN fund value, implying that the strategy doesn't work past that point. A competitor would then be stuck in a zero-sum game battling for a slice of a fixed pie rather than being able to grow the market.