Like, for example, I place bet on tennis N. B. Kjaer vs M. Dodig at casino A, go-to casino B and place the same a bet same option, different amount or same amount. Does that in any way violate any sports betting policy?
Why exactly will that be flagged as an offence or violate any rules? They are different casinos even if they use same sport book provider, they have no business with what you do on another brand. There's no way for them to know that you are same person placing bets. I could think of cases where two different casino is ran by same team but it just doesn't make sense if such were to happen. It's only when you use two different accounts on same casino, same IP and same kyc documents that might call for a violation or cheating. But whats the use of placing same bets on two different casino? It will only be costing you double of your risk. If both games were to make a loss, you loss twice what you were supposed to lose..
That's right, I don't see any reason how would betting on a different casino be a violation of their TOS and I haven't really seen that kind of TOS to casinos I used before. I also do not think of it as cheating given that you do a normal bet, just a different casino.
One reason I can think of why would people do bet the on the same team and the same amount of bet is would be the promotion bonus. The scenario I'm think is that OP found another casino that has the better odds or bonus but had bet early on his usual casino. On a normal standpoint where there's nothing to gain, it's very unusual to do this type of thing.
This might be a hypothetical scenario but I would like to hear casino representatives opinion in this kind of scenario.