For sure most of the experienced trader don't really listen in a simple video in youtube because it is just so obvious to them, Faking trading is just one of the method to easily influence someone that don't have enough experience in trading.
We should not generalized all the youtuber since there are some youtubers who do a good job regarding on giving a tutorial or any trading tips, but we cannot really erase that their are jerks entering the platform and spreading some fakes tutorial,click baits, and worse those scams promoted by them. And we should really think that there's no one can give us easy profit especially if they say we will get the profit from trading passively since this is totally scam.
Traders or investors that do youtube is actually doing a great job promoting and sharing their knowledge on youtube, But the thing is owners still pick top influencers on youtube that doesn't really know anything about trading or cryptocurrency. If you think about it, they just want to influence a lot of people in my opinion so a famous influencer or someone that has a lot of views and subscribers is most likely picked to promote fake websites, etc.
A lot of famous people tend to post fake trading photos in a lot of social media platform to influence a lot of people and potentially affect the market price.