Promoting cpa offers via youtube

[Nizar Hammati]

is it efficace that one of famous youtubers promote my offer after making a deal???
Exemple he say in the end of his video; if you want to winn an Iphone (that's my cpa offer) subscribe in the link below

 

[T J Tutor]

This is not a good way to promote CPA.

Asking people to subscribe before they ever see the landing page is a CPA killer.