Connoisseur of things and stuff. I do what I can. 
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You don't need to be part of YPP to use custom thumbnails, you just need to have a verified YouTube account (http://youtube.com/verify ) – these are the steps to verify your account: https://goo.gl/3iMkBG https://twitter.com/Diane_Banks/status/953534796256378880 …
YPP = YouTube Partner Program. The program allows channels to monetize their videos. There may be other features that become available as well, but I'm not entirely sure.
