If buying citizenships was illegal, the pressures that causing citizenship purchases would not go away. They would just become an incentive to more corruption.
It does have a lot of missing features compared to blender, and development has been very slow since Bjorng left the project, but it is really the most intuitive modeler I know.
Tipping is a terrible societal habit, though. Pay them a living wage, fine. Just don't force people to waste time on a another, entirely separate payment.