[product50]

You should understand that clicking on ad is not how YouTube or your friend makes money. The ad needs to have a conversion for the advertiser to continue spending on it. Imagine, if you are an advertiser and all you see are a bunch of clicks from YT and no conversions. Would you continue spending on that channel? Likely not unless you are a brand advertiser in which case they are also not looking for clicks.

Secondly, even brand advertisers have specific demographics in mind. So while a kid video will appeal to a kid specific brand (think cereals or toys), many brands won't spend in that category.

Given this, your thesis here is not entirely accurate.