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
I hope you compensate the Creators you’re hurting with this harmful and unannounced ‘experiment’. Maybe you should consider asking permission next time?