Because kalanick and early investor control the class B stocks, which means they control the voting power. Additionally kalanick has been outspoken about running uber himself so its unlikely that he'll step down.
If that is true, then I really need to drink my ethics out of my conscious, just grab that 'free' money, burn it on foosball tables, beanbag chairs, blow, trips to Goa, etc. and ride the late 'teens wave to a 'remorseful' book deal and the inevitable Scorsese film. Gosh, what is wrong with me?