What is your opinion on fake self-defense gurus?

Datboi65
Alright, check this out. There's this guy on YouTube with a channel title "Detroit Urban Survival Training" and he has been exposed as a fraud. He makes videos about what to to do if you are confronted with a gun or a knife, and the usual shenanigans about self-defense. My problem is that when you are teaching your students moves that do not work in dangerous situations, it can get them killed. The same goes for fake martial arts.

Here's a video just for good measure:
This can absolutely get you killed.

What are your thoughts on the issue? Do you think fake gurus should get sued, thrown in prison for what can potentially happen if you apply it? Or do you think they should be allowed to sell their courses just like everyone else?
What is your opinion on fake self-defense gurus?
11 Opinion