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
Change peoples thumbnails for people that don’t use them. 100% of people should see someone’s custom image thumbnail. That shouldn’t be a chance. Edit people that can’t do their own, not the ones who spend their time making them.