VEVO revenues are based on monetizing ads on your videos and number of streams (views).
The more views your videos have, the more money you will make.
The video monetization is therefore guaranteed.
However, effective as of February 20, 2018, YouTube will not allow monetization on any channel until such time as the channel has achieved a minimum of (a) 4,000 watch hours over the past 12-month period, and (b) 1,000 subscribers.
Further details can be found in YouTube’s blog posting: https://youtube-creators.googleblog.com/2018/01/additional-changes-to-youtube-partner.html