'Unfairness' is an incorrect term and brings to mind whining.
It is inefficient.
It is sub-optimal, for the progress of humanity, that good, motivated developers have to spend most of their time (or frankly, any time) on capitalist nonsense.
Work on a supermarket checkout, feed a few people, make a few pounds.
Fix a big in the linux kernel, millions will use it, you get zero.
Totally and utterly bonkers.