Sometimes betting companies (who are of course bad) offer special promotions which gives you the chance to do arbitrage betting, meaning that it is possible to bet such that you win the same amount of money regardless of the outcome, if you bet the proper amount on different events. Is placing such a bet halal or haram? The money that you get does not depend on the outcome, moreover, you only take it from a betting company that ruins people.
Also, if I know the outcome of an event for sure, is it allowed to bet on it at a betting company?