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Hey @new-sky.
It's pretty simple. First someone, as me, invite you for the whitelist. After that, five people which are in the whitelist are choosen for vote if you have a good content and don't go against the Terms of Services. After that, some admin in Minnow Booster approve you and done.
It's matter of time to be really whitelisted. ;)
Cheers!

Thanks for explaining this, Roberto!
I hope to get whitelisted in the future and so will do all I can to keep producing quality content while adhering to the TOS.