The type of bonus you are referring to is called a sticky bonus. A sticky bonus is a type of bonus that is credited to a player is account, but cannot be withdrawn or cashed out. Instead, the bonus funds are used to place bets and to play games, and any winnings generated from the bonus are added to the player is real-money balance.
A sticky bonus is called "sticky" because it is meant to remain in the player is account until certain conditions are met. These conditions may include a minimum number of wagers or a minimum amount of time spent playing the games. If a player fails to meet these conditions, the bonus may be removed from their account, and any winnings generated from the bonus may be forfeited.
Sticky bonuses are often offered as a way to incentivize players to try out a new online casino or to encourage them to make a deposit. They can be a great way for players to get started and to try out the various games on offer, as well as to increase their bankroll. However, as with any type of bonus, it is important to always read the terms and conditions of a sticky bonus before claiming it, as there may be restrictions or wagering requirements that apply.
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