Free spins bonus are not really free and they usually have those wagering requirement that is why I never get interested to those type of promotion.
It’s still free money. I don’t understand why anyone would say no to free money! Yes, you will most likely lose it all before completing the wagering requirement but at least you got the chance to play games for free. If you complete the wagering requirement and end up with some profit then that’s great, if not then you have at least enjoyed your time without losing anything.