Investment and trading books, articles and videos are made by people who might not actually be winning traders. They make their money by writing "investment materials" and sell it to us, the plebs.
This is 100% true and for sure a lot of writers or people who are writing some content about trading are really losing money on trading and they are just making money on these books or some are making money on affiliates like inviting someone to signup under their links on some exchanges and they will earn money via commissions.
Well, the fact is it's quite hard to believe some of them, in an educational content they always show something like what we need and even with some of the strategies they exemplify. When we saw it, it looked like it made sense, and then we went to do it according to what we got from them, for the result, maybe you already know that 50 - 50, some are really accurate according to the market and some are loss until you get MC . To be honest, this is also what I often asked when I was a beginner, how to find a mentor who is truly experienced so that our learning process can be directed and in the end I decided to study alone without a mentor and would only read books on trading in several library.
Maybe there are also some of them who have difficulty finding the right mentor or reference. So, you are absolutely right, recently I heard that one of the content creators who always educates about trading has been arrested by the authorities for defrauding many of its members, cases like this have now happened a lot and many have become victims. Most of them just want to take advantage of us, as you said, most of them are affiliates who take advantage of the situation and get a lot of profit there. So the point is to be more careful when looking for a mentor who is truly experienced, find out the person's personality first, don't let them have the opportunity to deceive you.