Some sites/sportsbooks will also limit your account or even ban your account if they detect you're trying to arbitrage games, which is something you should be aware of before trying this out (and a big reason why I don't arb/stopped arbing). I've never really tried arbing on crypto-based sites before so I don't know how they tolerate it, but on fiat sites you'll usually get shut down really fast.
It's practically impossible to be caught doing it.
Unless these casinos are sharing information without your consent, matching bets with a name/IP address, then it is literally impossible to get caught.
I don't think I have heard a single instance where a person has been caught arbing on a crypto site (I'd love to see evidence to the contrary).
Either way, OPs post looks promising, always good to have a little side income. Though I do question what OP gets out of these signals.
they can't be 100% sure that you are arbing , but everytime you are betting big amount with a book that has the best odds for that selection you become suspicious
also real books have traders who sometimes won't notice that there is an arb opportunity , but they can easily check the prices in other books after you make the bet and they can be sure that they were offering an arb
books who limit don't care if you are arbing , even if you aren't arbing but just beating their starting price they will limit you ( that happened with me with 4 bitcoin books so far )
3 of these books limited me 2 or 3 years ago because of arbs , but the 4th one just limited me because I was beating their starting price and the max bet I had with them was like 300$
so unless you have ways to keep creating accounts everytime you get limited then arbs won't work really