I don't think you can include things like Patreon in a "get X amount in Y time" idea, since it's generally used by people who are giving you money to get something at a later date (i.e. outside the Y days window).
Well... I haven't used it in this challenge (although I wanted to), but I don't see why not.
You basically have to sell them something (eg. today) and they'll join (today) and pay (today) - so it's within the Y days window.
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