I'm well aware of the cancel feature as this goes back to the 90's .

Tell ya what, if the caw are making $10,000 bets and cancelling within some 5 second window , just shut the game down now, and arrest everyone involved.

I don't think that's happening, but it should be impossible to do. I thought I saw a quote claiming they could not cancel bets. I rarely see anyone cancelling even mid betting, except for a mistake thats obvious .