That's... making them lose out money though? I mean sure, if you missing the cashout was their fault then maybe yes, there's some reason to it. But no, it was YOUR fault that you missed the cashout option, with whatever reason it may be. It's implemented in trading imo because of how fast the market can move at times and exchanges don't necessarily lose out that much due to the sheer amount of volume of trades that happen. In casinos though? They look at each match as a single instance. So setting up one for each instance would just invite losses for them imo.

And to add, trading is you fighting against other traders, a zero-sum game. Last I knew, gambling is you fighting against the bookie, not other players.