Either billionaires really earn their pay, which implies that they are thousands of times more productive as a person than the rest of us - literally superheroes.
Or - if you accept this as the obvious bullshit that it is - then all that money is not a fair compensation for anything, but rather the consequence of being in a position of economic power that makes it possible to extract wealth from the economy in one way or another. How exactly said extraction is done is immaterial - if the wealth is unearned, it means that it was taken from someone else, since someone ultimately did the work necessary to create it.
Or - if you accept this as the obvious bullshit that it is - then all that money is not a fair compensation for anything, but rather the consequence of being in a position of economic power that makes it possible to extract wealth from the economy in one way or another. How exactly said extraction is done is immaterial - if the wealth is unearned, it means that it was taken from someone else, since someone ultimately did the work necessary to create it.