This is a great question. Just because a Broker offers some type of bonus for deposits, doesn't mean they are bad brokers or that you should approach them with caution. Most of the time, Brokers do this to help them take on newer clientele and expand their reach to a broader and newer audience. But there are limits on withdrawing whatever the initial bonus amount was. So typically they will let you use the bonus as additional Margin/Equity to place larger traders, but you will not be able to withdraw the actual bonus itself...just profits made above the initial bonus.