If you know what hypnosis is, then you should understand that you can hypnotize a person with certain actions. There are many varieties of hypnosis. Manipulation is the main feature of scammers. Perhaps they do not act with a uniformly moving pendulum in front of their eyes, capable of hypnotizing a person, but act on the human psyche, knowing all sorts of tricks that ultimately lead to the goal of fraud. Read what NLP is. Those who master it perfectly can influence the person who gives out seed phrases.
There are so many good books out there that can explain the effect various hypnosis techniques have on the masses. For example, in the book of Robert Cialdini "Psychology of influence", some of the manipulation methods that we see every day but do not perceive as hypnosis are well described.
It is not for nothing that some religions call for always controlling oneself and being at the moment in order to be here and now.