For this particular example, this would mean that if you deposit $100, you would start with $200 in your account. You must make $5000 ($200 × 25) in wagers before withdrawing. This can be played at a game such as blackjack.
Some simple arithmetic shows that if you leave after meeting the requirements, you have a very large edge. For example, the house edge in blackjack is around or less than 0.5% at most online casinos. $5000 × 0.005 = $25. Therefore, you expect to show a $25 loss — however, you were given a $100 bonus. Therefore, your expected profit is $75, a massive 75% advantage. Usually, taking advantage of such a promotion is the only way to gain an edge over the casino. By adding in a No Deposit Bonus you increase your edge even further.