I don't necessarily think it is fair, but my guess is that even in your example, the inventor is unlikely to get paid very much by the community unless they had

I don't necessarily think it is fair, but my guess is that even in your example, the inventor is unlikely to get paid very much by the community unless they had a maintenance agreement worked out in advance. They might be able to get some funding through something like the Nobel prize or Gates foundation. Like the author of the article, I've observed that if you give a gift, it's very hard to charge for it after it’s been accepted. Whether this is innate to human psychology or caused by social constructs, I don't know, but it basically feels like a law of the universe.