Regarding the witchcraft fence and its existence in finding

This is an ancient dispute among the Rishonim, and it was discussed at great length in the book "Vayishev Hayam" by Rabbi Yaakov Hillel, the Kabbalist of Jerusalem. The method of the Rambam and his followers is that there is no substance to these acts, and the basis of the prohibition is being a fool/naive person who believes in them. And what you brought up in his name is a distinction between a situation where I am blindfolded without saying that it is just cheating and a magician like today who announces that it is just cheating. According to the Rambam's method, everything that works is permitted. But not everything that is thought to work really works (there are quite a few fools who follow various 'techniques' of alternative medicine and the like, which in my opinion is similar to these prohibitions). The method of the Rishonim who disagree (it is accepted that this is what the Ramban believed, although as far as I remember he has some contradictions in this) is that there is a real meaning to this. Their claim is that there are powers that belong to the Sitra Achra (the other side, not of God and nature), and that there is a prohibition against using them. They believe that these are powers that exist but are not part of nature but rather from another side of it. The big question here is the question of diagnosis: How do you know whether the power you are using is a real power from the right side or a real power from the wrong side. I don't know. I am of course inclined to the Maimonides' view, although it must be said honestly that this is not the simple interpretation in the biblical sources and the Sages.