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Re:Ask HN: Side project of more that $2k monthly revenue wha... by kube-system on Friday April 14, 2023 @11:30AM (#35570657)
Royalties are typically a contractual payment, though. Calling a voluntary payment a royalty is kind of an odd use of the word, if not plainly incorrect.
Re:Ask HN: Side project of more that $2k monthly revenue wha... by taftster on Friday April 14, 2023 @11:41AM (#35570801)
You're right, these are donations. But they are donations that are determined based on the number of units sold. I believe that's why the parent is using the term royalty.

It's not a contract, as the term "royalty" implies, but it is a royalty in the sense that it's determined per unit sold.