Fair point. Casino nowadays especially the new one is already modifying their ToS to compensate with their marketing like what the OP experience. Casino offer a bonus without wagering requirements so that players believe that this is a free money while the ToS indicates the wagering requirements is transfer to the deposit which is equivalent too on bonus that have a wagering requirements.
ToS is very tricky. Players should be vigilant on checking first the rules and do a screenshot as much as possible so that they can have proof in case casino alter some of their policy for their own advantage.
If any casino publish that they are offering bonus with no wagering requirements but when you try to claim the money, they ask you to check the terms of service, where it is mentioned that you need to fulfill the wagering requirements in order to withdraw, if this is the case, you should immediately stop playing at that casino and leave that casino because they do not keep their works and are scammers.
If they do this purposefully, you can understand they are not honest and it would be not safe playing at such casino. Leave those ones as there are still many good casino out there who do not do these cheap acts.