What is masmarizam or hypnosis? Is it hypocrisy? Or is there any scientific explanation?

Anyone can be mesmerized. For example, the sunrise at Kanchenjunga mesmerizes many people.
You are probably talking about hypnotize. Many people have reported this matter. I will give just one example.

Don’t think you went to the salon to get your hair cut. After the hair cut, the salon guy gave me a light head massage before cleaning the cut hair. After that he asked you if you want a massage, you said yes. After that, one service after another continued to be offered, and you continued to follow him.
In this example, the success rate of the salon is not 100%, but it is quite good.

In my opinion this is also a form of hypnosis.
So it would be wrong to call it a complete hoax. It’s all a psychological game.