I agree with you because casinos are businesses and they are profits oriented and at that it is very important to adhere to the strict operational conditions that helped both the gamblers and the casino but most importantly the casino is favoured when it comes to giving out free money in form of bonuses and since the casino doesn't want to give out free money the accompanied their bonuses with high wager requirements.
So also we have to be smart enough to know how to apply ourselves to all the conditions that the casino may put up when we are chasing bonuses.
Casino bonuses are a common marketing strategy used by online casinos to attract new players and retain existing ones. These bonuses come in various forms, such as welcome bonuses, no-deposit bonuses, free spins, and loyalty rewards. While they may seem like free money at first glance, it is essential to understand that casinos are businesses aiming to make a profit as you have noted and so, the terms and conditions attached to these bonuses often include wagering requirements to protect the casino’s interests.
Wagering requirements dictate how many times a player must wager the bonus amount before being able to withdraw any winnings associated with it. For example, if a casino offers a $100 bonus with a 20x wagering requirement, the player would need to wager $2000 ($100 x 20) before cashing out any winnings.