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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 …
Also the monetization and adsense, from the past when I signed in to YouTube, but in order to access custom thumbnails or 15 minutes + and monetize videos, I would have to verify. I am a real genuine person who make videos.
