Most online gaming sites that give out matching bonuses to attract new players have a rule about bonus money and when it can be withdrawn. Every site has its own set of rules and a player would be wise to read the rules for a site they are going to play on. There is no standard rule about matching bonuses.

Casinos that offer out sized bonuses are very likely to have a play through requirement. In many casinos this number is around 30 times the bonus plus the deposit. This means that if your first deposit was $1000 and the casino was willing to match the deposit. The play through would be $2000 times 30 or $60,000 in wagers. That is a difficult amount of wagers to make over time. Most likely the casino edge would work and reduce your betting stake. Also to prevent early withdrawal of the initial deposit, the casino has a rule that early withdrawal of the money would eliminate the bonus in your account. Another rule is that some games do not count against the play through number. This can be zero up to 100% of the wager on the game. Some games will not count at all under any circumstances.

The point is the big bonuses may be just an illusion of real money, since the player will never get to the bonus money. The play through rule at 30 is patently unfair to the player, as it cannot be wagered free. So these casinos that offer 500% bonuses are using the bonus to attract players and rarely have to deliver on the bonuses. There are some newer sites that have smaller matching bonuses that have no requirement or a small number like 5 or so times the bonus plus the first deposit. These are worth looking at if they measure up in other ways.

The rules are usually posted in the cashier section or in the terms and conditions section that you are supposed to have read when opening the account. A player can also use search engines on the Net to find low play through requirements and the casinos that offer this deal for their players. The only way to find good deals is to look at many casinos that offer low play throughs. This is spectacularly true on some of the big bonus sites.