I'm actually curious now of how many first world countries are as backwards as the US where if you retire without any personal savings you are extremely screwed.
You shouldn't always work just for money, but this is financial ingratitude.
You can offer him all the $5 donations in the world, but he has a full-time job now and has no reason to return to this life of "financial ingratitude".
I'm pretty sure we all would miss him working on it, either directly or indirectly, I think, as developers, we do a horrible job of assessing our blind spots when it comes to infrastructure.
It may not be financial ingratitude. It may be that we just haven't reached a sensible equilibrium between the two symbiotic ecosystems. At some point in the future, "due diligence" might commonly include identifying these sorts of tools, and their developers, and deciding either to not use the tool or to fund the tool's health.
In your scenario, what will happen to GPG? The world just loses this essential asset?
It's not an either-or choice; There are solutions that help him and GPG.
I say f*ck the world.
It won't suddenly erase itself from all the world's computers. It'll still be there. It'll still work the same way it worked the day before.
Perhaps someone else will pick it up?
He's not immortal - at some point someone else has to step up to the plate.