As the other commenter pointed out, it's whether they want to be; I went to an evangelical church in the US one time, and they were using a lot of hypnotizing techniques to their audience. Many in said audience were very receptive to it, going into a trance-like state themselves. It wasn't for me so I wasn't influenced by it, but I can imagine how many people want to be and enjoy it.

That said, when going in for psychological treatment, some people get tested extra for e.g. autism, as that will influence the effectiveness of certain treatments; apparently CBT doesn't really work on autistic people, possibly because they're too analytical about it (my take, I haven't read the actual reason).

>it's whether they want to be

I think it's necessary but not sufficient. I was hypnotized by a stage hypnotist, and it didn't work, even though I wanted it to, very badly. I tried. I was so excited to be called up. I also tried binaural beats a long time ago and that didn't work for me either.