If the donation is framed as a single developer benefitting it should be fine, but at least when I was donating that was framed as donations to the project which suggests something else.
I'm fine with this use, rewarding a developer, but neither was this transparent nor was it fair for all others working on the project (and supposedly getting cost claims refused).
I'm fine with this use, rewarding a developer, but neither was this transparent nor was it fair for all others working on the project (and supposedly getting cost claims refused).