Arbitrage betting is forbiden on casinos, they consider it as an abuse, and I don’t know how but they will know if you are doing it with multiple casinos, so, users must be careful about this linda of practices because just as op mention they will close your account and keep your money of you they it.
If a gambler is using arbitrage on different casinos how are they all traced and connected? Are the casinos working together to fetch out those doing it ? I think it is traceable through KYC verifications, this is how they are identify w particular user that uses different platforms to try and cheat the system. I haven't tried this betting system before and i don't really know if it's something that actually works.