Thanks for reaching out! If you’re talking about Channel Memberships, our Help Center article has information about the eligibility criteria: https://goo.gl/TTWDpK . Hope it helps.
@TeamYouTube I'm really looking forward to the Member / Supporter Button. Is there already a date on which it will be rolled out further? (I'm german, Channel >10k)
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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