The driver took a risk, and went is possibly going into bankruptcy because of it. He did this based off of the pay structure which Uber offered him.
They changed that pay structure, and he got screwed, with little recourse. He had an opportunity to complain to the head of the organization which made that change and took it.
The CEO in this situation could have been more supportive, understanding and offered some recourse... even if it was just to email some HR or driver support person at Uber, that would have been a better response.
Instead the CEO felt attacked, kicked in his defensive mode, was flippant and dismissive of this persons struggles. Zero compassion or empathy, that's the problem here.