A sticky bonus is simply a bonus you can use to make bets at the online casino but you can’t withdraw. Sticky bonuses are usually offered to high rollers and can come with quite high percentages like 300% or 400% match. Any money you deposit and win is yours but the value of the bonuses itself cannot be withdrawn.
Sticky bonuses are great if you have a big balance in your account as they give you a lot of extra chances to play your preferred games. The downside, of course, is you can’t actually take that money out and put it into your bank account. Once you do make a withdrawal, the sticky bonus will also likely disappear from your account. These bonuses will be listed as “for play or wagering only”