If you ask which casino, I'm afraid I've forgotten what it was called but the memory of the 100x wagering requirement does go back before. Casinos that don't want to take their business seriously will apply very high requirements so that no gambler can take their winnings freely. And even if the gambler can take it, the casino will apply other requirements, such as the gambler must do KYC but the casino will not agree with many reasons.
Indeed, casinos with big wagering requirements aren't a scam, but many don't even want to try them because it's too much for them. After all, many of us are not big gamblers and only use small amounts of money so it will be a problem for them.
100x wagering requirements is just an unrealistic target set on the gambling site so that no one can win the bonus money and take that money home.

I understand that gambling casinos cannot give free bonuses because then that free money may be misused by the gamblers only for withdrawal purposes but asking them to complete 50x or 100x wagering is not a good approach as it clearly shows the evil intention of the gambling sites.
I would suggest gambling sites to set lower wagering requirements so that some of the gamblers may be able to fulfill it and can claim (withdraw) the bonus money.