Are you asking why executives aren't decreasing their own pay?
If the executives of Uber could just ignore shareholders, they wouldn't need to worry about profits at all.
How would you prove a decision was wrong without hindseight? How would you prove an executive shouldn't make X amount of money?
Imagine I'm the CEO of Nike, I make $100 million a year. The company is doing amazing. Is that because of decisions I made, marketing, good product, word of mouth, things that happened before I was CEO. Prove that I shouldn't get that money.
They don't get the money back they already spent, of course.