This might be anecdotal, but I feel like we don't hear these athlete bankruptcy stories as often about hockey players. Why? Because they're all white, not black. Putting a kid through junior hockey is expensive and hockey players tend to come from privileged homes with much better financial education than young black football players. They get just as many knocks on the head, but they get better advice from their father's accountant, and they make it to retirement with some money left.
Making them sign away control of their money sounds like a new version of the old story of infantilizing black people by removing their adult rights, "for their own good".