Well, making a profit has not been interpreted as giving out virtual benefits in exchange of money. Generating revenue is not profit.
I think you're right though: If you assumed it was profit (again, I and, as far as I'm aware, all tax law, rejects the idea that simple revenue = profit) there'd be no difference between selling a virtual sword (that isn't part of DIKU, but part of your code) and selling a sticker or a character sheet. There's a difference in terms of in-game impact, but the DIKU license doesn't mention in-game impact nor does it imply that it's at all concerned with the distinction, so it's hard to see how that's relevant.
--matt
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