Casinos tag a wagering requirement to their no deposit bonuses. You need to wager your bonus a specific number of times to be able to withdraw winnings earned from it.
For no deposit casino credits the wagering requirement is on the bonus on offer, and for no deposit free spins it is on the winnings earned from it. The wagering requirement is usually higher for no deposit bonuses than for standard bonuses that casinos offer.
For instance, a casino may offer a no deposit bonus of $20 in casino credits, with a wagering requirement of 50x. This means you will need to place wagers worth $1000 ($20 x 50) before you can withdraw any winnings earned through the bonus.
Casinos are constantly evolving new strategies to make their promotions more usable and player-friendly. Already, you find games with low wagering requirements compared to what has earlier been associated with no deposit bonuses. One approach that has been a big hit among players is offering games with zero-wagering requirements.