CNC as a kink is fine, but to be done healthily requires really solid negotiation skills by all parties. Ain't no way in hell you can implicitly consent just by going to a party. Even the most edgey edge-player (someone who does risky bdsm play) I know would nope the fuck out of that.
I really hate the things that human beings are capable of.
We can be so much better.... but instead we get depraved, morally bankrupt, power hungry pieces of literal trash doing this sort of shit in what seems like every industry.
CNC can be done ethically, but it requires very careful negotiations and setup. I've heard of CNC orgies with mandatory classes for everyone. If I had a partner who wanted it, that level of setup is about the only way I'd agree.
Doesn't sound like they're doing anything close to that.