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.
There are many ways for different casinos to find arbitrage players, the simplest way is Pattern Analysis:
Very fast bets placed right after odds changes
Always betting on specific markets prone to arbitrage (e.g., over/under, 1x2)
Always betting max stakes at value lines
Never taking poor odds (suggesting you’re scanning odds across platforms)
then other methods are using direct technical tracking, they can detect arbitrage via:
Many casinos and sportsbooks outsource fraud detection and risk control to third-party services like:
SBTech
Kambi
Sportradar
BetRadar
OddsMatrix
These providers operate across multiple platforms and share intelligence about suspicious behavior, including arbitrage patterns. If you’re taking one side of a market on one site and the opposite on another — they see both sides.

This is a really good post. One thing to add is most don't arbitrage, they just play the weak side.
I only pointed out that the casino's refusal to ask the client to verify his account is bad form and should lower the casino's rating very much!
And I see no reason for it.
Apart from that, no reputable casino will refuse your documents because there are thousands of accounts from your country using the same documents. Unless you are trying to deceive, by using forged documents just avoid any future trouble.
My message on this forum is to convey from inexperienced community members how the casino cheats them even before the game starts! So if the client wants to get verification before the game starts, then the casino is obliged to do it! If the casino refuses, then this should lower the casino's rating!
Same bs.
Therefore, if you see that a bookmaker confiscates a client's winnings based on arbitrage bets, you must clearly understand - this bookmaker is engaged in fraud!
It is good that most of us don't have your level of clarity

What if a bookmaker accuses me of arbitration and confiscates my money, and in response I send him a lawsuit with evidence that each of my bets was 100% not arbitration!!! How to prove this?
Arbitrage opportunities are very rare and can be easily narrowed down by bet providers. No reputable casino is built upon malpractice; it is simply not sustainable.
Go look at scam accusations. All the big books are scamming with the arbitrage rule and multi-accounting.
I should say all the crypto books here, not fiat.