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
Also wanted to mention, it's easy to accidentally skip over channels u would normally watch because the thumbnails don't always give u an indication of who they're from. Sure you can look at their channel name but most of the time if ur just skimming thru you don't.