The highest you can do with such a bonus is to make more bets and play more games and in trying to meet the wagering demands you will end up losing that money ey to the house.
Casinos are profit-oriented and would like not to do a free bonus giveaway when a gambler has not shown any sign of commitment to their casino. They also know that gamblers are everly ready to exploit them via any lapses they see. Casinos always follow the running trend to remain relevant and would not do away with the bonuses because they know what best to do with them to get more customers to their casino.
As a gambler, it is an added advantage to make use of the bonus to win a good amount of money so that if wagering, you could get something meaningful and tangible at hand rather than just peanuts. Although some casinos allow wagering for bonuses in the same percentage as won if I am not mistaken but any gambler if attempting to make use of the bonus, should earn a good amount so that when wagering they know they are getting something good out of it.