Most of gambling casino is giving a lot of free spins to the player who makes a deposit with a designated amount also have designated spins as rewards but the free spins are just bonuses but it doesn't give the same value as your spins just like cents and those free spins more likely having a range from 20$ winnings I'm not saying they are giving with this amount but a possible average of winning, still ideal you have enough budget to play more spins to get a huge amount of multiplier, don't get rely in free spins only its just bonus deposit.
But there are still people who can win more money than they deposited, so they keep trying even though they know they will only be able to win a small amount of money. Maybe they think it's still worth doing so we see some people still chasing bonuses in the form of free spins from the deposit amount determined by the casino. But some people are not enthusiastic about pursuing it because they have their own calculations and it is better to play gambling as usual.