Dont do this because this is an arbitrage trading and some casino doesnt allow it since you are taking advantage on the odds of the sportsbook. Many syndicate is doing this and earning huge amount of money but they are being monitored already after they make the profit. You might be accused that you are involved on this shady activities and your account might be banned permanently.
Casino preferred to bet only on one side instead of doing arbitrage bet on the two sides of the game. Im not sure if Duelbits allows it but some casino dont condone arbitrage.
Lol. Arbitrage betting isn't shady or suspicious. It's completely legal, but books obviously don't like them since they are sure bets which would hurt their business. They don't outright ban such punters, but restrict their bet sizes usually.
Also, arbitrage betting usually involves multiple sportsbooks since it's almost impossible to hedge pre-match bets in any singular sportsbook.
Even if a gambling site do not allow you to bet on all the possible bets of match, you can still do arbitrage betting by betting on one team in one sportsbook and betting on another team in other sports book as the odds are usually similar or very close on every sportsbook.
For example , you are betting on a football match, you can bet on Team A on one betting site, Bet on Team B in another betting site and also bet on a draw in third sport book.
I don't know how can you be in overall profit as you will only win one bet out of these three bets and you cannot gain profit through arbitrage betting in most of the cases.