> That has proven not to be the case with sports betting. Otherwise every major league pitcher would be needing armed guards to stop all the people with pipes trying to disable them.

This is a ridiculously over-broad claim.

First of all, prediction markets shift incentives in a pernicious way; they don't magically erase or override all pre-existing incentive structures.

And secondly, professional athletes of all stripes appear to be receiving a lot more threats of violence from gamblers (including "prediction market traders") than they were a few years ago.