Ok, and how can bookie prove that he is doing match betting?
Today bookies can accuse for anything and take your money, cancel bets, etc as in their t&c is stated that they can do whatever they want.
I am doing this for more than 15 years and I could write a book about sportsbooks, bonus hunting, arbing, value betting, courtsiding, etc.
It’s very simple since match betting is technically using of casino bonuses such as free bet to take advantage to the casino, they can simply create 2 different account on different casino and place bet on both side which have a +EV then enjoy the bonus with risk free bet.
Bookie can easily confirm this since crypto casino usually use same bookie and they have connections to each other so that they can match players information and to check possible connections of all accounts from different casino. This is what most players that have a problem do.