Why didn't you put two locks on your door? Clearly you deserved to get burgled if you only used one.

Building Byzantine fault tolerance into absolutely everything is expensive, and makes everything we do and buy more expensive. It would be better and cheaper to rely on social trust, if that's possible-- and it was possible before these gambling sites. Prediction markets are burning social trust as fuel to make profit, they should be heavily taxed, the way polluters are taxed, as destroyers of the commons.