They may give you a bonus, let's say in the form of free spins... And then your free spins may end up netting you 20$ in winnings. Well,.you will find out that free spins are limited to up to 5$ per giveaway of free spins... And then you at least have 5$ right? Well, no! You still have to fulfill a wagger limits. And your 5$ had to be staggered at least to a gross turnover of $300! That's 60x... And not only that, you can only wagger on a selection of slot games and nothing else. If the wagering could be done on dice or something with low house edge, whatever. But they really really don't want you to win anything by forcing you to play slots with 5$.
Anyway. When I see something like this for free spins I'll be sure to never use any deposit bonus in such casino. Bonuses don't have to be huge when you're forced to lose everything. Just give a few cents and might as well keep it simple and give nothing. Right?
They do differ in numbers but not really that much on which it is really that normal that they will really be that having always the advantage towards gamblers. This is how business works and since you've been dealing up with bonuses then you do have to bare on the things that they are really that setting on. This is one of the main reasons on why bonuses isnt something that sparks out my interest because of these kind of terms on which it do really sucks big time. You wont really be able to get out easily if you wont really be that lucky enough.