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Let's hope Github will find a way for users to be able to 'tip' maintainers. I concede it is very hard to find the solution (Who? When? How much?)

I assume this is already possible with ChangeTip. I don't think it would ever be built in as a feature.

There is also Patreon. I have seen people fund project maintainers this way. Enough for a full income https://www.patreon.com/foosel