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If we draw an analogy with Remix, then mapmakers should rather set up their own Patreon pages, and let people donate there. Using a contest system is a workaround that:
a) excludes some funds (at least because the logic of the contest implies rewarding only the finalists)
b) creates additional unnecessary responsibility and hassle for the organizers (they need to organize the collection of these funds and delivery, and enthusiasts don't like to receive money, at least some of them...)
In short, independent organization of donations by successful mapmakers seems like a more sensible approach.