Pls @TeamYouTube, let me have Custom Thumbnails back on my account! I really don't want to be part of your test anymore... I want pretty thumbnails back!
pic.twitter.com/Y5CrVmOmF9
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Yeah I thought it was a lower % than that. I haven’t noticed any changes on channels I’ve looked at....
My entire YT experience has been stripped of custom thumbnails. I'm part of the 0.3%, which I didn't ask/want to be part of 
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