Sharing answers to top q's we’re seeing about the thumbnail experiment: – Custom thumbs aren't going away – 99.7% still see the creator's custom thumbnail – A lot of creators use auto-generated thumbnails, this test helps improve them for those using them: https://goo.gl/A7oDmr
Dude if you are really going to implement this, please make it OPTIONAL! Don't force it to everyone again, lot's of channels need the custom thumbs to survive.