Have these parents tried to not let the salesman in?
In my first message I was not targeting those parents who try to block this but can't; I was targeting those parents that use Youtube to distract their kids since they are babies, those who give unrestricted access with no control at all, those who don't care. We all know people like that.
This is just an hypothesis, but if parents were fined every time their kid accessed social media, I'm sure most kids wouldn't be on it.
The "just say no" argument, basically.
There is also the education part that for some reason we are ignoring. Kids are going to be able to access drugs in locations where they are unsupervised, they are going to be subject to peer pressure, etc. The job of the parents is to prepare them for that, as they should prepare them for the negative effects of social media.