So having a reasonable wagering requirement is essential for a casino to stay in the business and keep getting new and active gamblers in their platform. We as gamblers will need to understand it from their perspective as well.
if the casino provides a bonus without a certain requirement, it can actually be a loophole for those who want to take advantage of the bonus given for their own benefit.
even today many people fake KYC to be able to participate in a campaign that gives certain bonuses. you can imagine if the casino distributed free bonuses in several events, which I think is really detrimental to the casino and will not get feedback from what they are doing.