Or each package's maintainer can set a proportion for each of its dependencies, so that every time a donation is received, a certain amount of that donation is

Or each package's maintainer can set a proportion for each of its dependencies, so that every time a donation is received, a certain amount of that donation is automatically transferred to those dependencies according to the proportion set by the maintainer. The donation sent to those dependencies is then propagated to their dependencies automatically according to ratios set by the maintainers of those dependencies.