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
Put a damn notice out and let the people you've chosen for the experiment know a few days before next time. Quit with all this surprise springing it on people bullshit. No one likes that! Pass that along.