Fair, by definition, is when the market reaches equilibrium. The shareholders think this is a fair salary. Why is your opinion more valid than theirs? Sure, the salary is high, but it seems commensurate with the value that Amazon generates. Literally 30% of the entire internet runs on AWS, and that's just one part of their business.
Given that Tim Cook earns ~100M yearly, and Satya Nadella is at ~50M yearly, it seems low in comparison.