1x is fair, but OP's concern is that the gambling site he used requires him to make a 5x wager of his money. I agree that this is a significant requirement, and it seems like the site wants their gamblers to wager more, thereby decreasing their chances of winning. Just imagine being lucky and satisfied with your winnings, but you haven't met the requirement yet. Then, with one wrong bet, you could lose all your money. That would certainly be disappointing for any gambler.
The question is that, did the ops read the terms and conditions of the casino before the problem occur because I am sure that all the wagering requirements are mentioned in the TOS and that gamblers should be familiar with such high demand, and if it is mentioned in the documents that the casino demands for 5x wagering on deposits that justify the demand for oos to fulfil that requirement before withdrawing from the casino.
Unlike in some cases where the casino hides this rule from the players and thereby takes them unaware when they are requested to make 5x wager before a withdrawal is processed, that way the casino already violates the player's right by so doing.