That was indeed an important bug for the rest of our findings. To give you an idea on why is this data so important to Uber, this is what we got so far:
1 - Possibility to brute force invite codes in riders.uber.com - $5000
2 - Possibility to view sensitive data from other riders and drivers - $3000
3 - Possibility to get private email using UUID - $5000
4 - Information regarding trips from other users - $5000