We've made updates to the YouTube Partner Program to strengthen our community & prevent impersonators + spammers from harming our platform. We understand this affects many channels, but believe it's necessary to protect our creators. For the full updatehttps://goo.gl/T1pvG3
It was pretty clear. The watch time is the main issue. You either have the subscribers or you don't. Having those subscribers doesn't mean they are watching your content.