Arbitraging in general means you have limited the risk by betting on both sides of the market. So in the case of sportsbetting you bet that Team 1 and Team 2 will win. In most sports outside of american soccer you have a winner. So Team 1 or Team 2 will win, in which you have bet on both winners.
If you look in the OP you will see an example, where the payout is larger than the original bet + the losing bet.
Seems now to make sense, and I have some ideas regarding this. I will do more research about it. Thank you.
Odds change every second, so you have to be quick!
Then is there not a chance of marking the bet as a late bet by the provider?
Im not 100% sure what you mean by your second comment. But if you mean, is there a chance the second bet doesnt go through and the odds change before its accepted?
Yes this can happen, but there are a lot of different ways you can hedge this risk and avoid it. With arbitrage betting you won't successfully win every bet, because sometimes the odds will shift and you will need to take a hedged loss.
However, there are a lot of different things you can do to understand these risks. Ex: If its the 4th quarter of the game, you dont wanna bet because the odds shift way to much.
or
you typically want to bet on the favorite first, because then if the odds do change, its more likely to be in your favor, or not be as hurtful.