Correção de texto: Dangerous Tutorial

I used to watch some tutorials on the YouTube to accompany my classes at college. Then I figured out that there are some of those tutorials which is made to fool the vestibular students, in other words they make this to eliminate the competitors. They teach the subject wrong to them just because they want everybody go bad at the vestibular. Luckily I've never used tutorial videos which was explaining wrongly and harming the students. In my opinion it should be an offensive and they should be punished.