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Donation platform
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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I've asked the same question in the past, and see it keep coming up. The lack of something centralised or coordinated for donations is a massive missed opportunity for FOSS.
This is exactly the sort of thing I think the FSF should take on. They are a nonprofit which exists to promote free software, and I think this should include the freedom to donate and receive funds. They are smart people and I'm sure they could figure out how to do it in an efficient way.