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Maybe FOSS products should offer PDFs of the documentation as a "tip jar".

Format the documentation as a PDF, enable it on https://www.lulu.com/ and sell it for $100-200 (and a hardcover at some stupid high price).

You’ll collect a few.

I’d do that even in my personal capacity. Buy a new copy every major version release (where that’s applicable).

At least the new edition would be a worthwhile expense.