they dont mark you as arbitrage, you're confusing something, accusing someone of arbitrage is a very difficult and unprovable matter, because their sports line is used by many providers and not just betby
This isn't true at all and I am speaking from experience. Multiple sportsbooks usually use a single provider due to which they ended up sharing information with each other without disclosing the details to the public.
If you are identified as an arber at one site, other sites using the same provider could ban you quickly because of their information sharing tactics.
Didn't experience this and never encounter such situation, but as what I research you are right that if multiple casino use the same back end provider then it happens that you got flagged on other casino there's still a big chance that you get compromise on the other casino with same reason.
If this is the case and if its true the user is doing arbitrage then I guess this is the reason on why their account has been compromised.
This is the reason they should not do those actions because those thing bad things they did will haunt them on other casino.