I know 3 is wrong since I got offers from both companies. At least for new grads. Uber's Salary offer was actually pretty terrible compared to the other companies and they wouldn't budge on anything except stock options which are monopoly money. And when I say terrible, i mean the stocks were worth half and the salary was 12k less.
Anecdotally, they have made some crazy high offers, even to new grads (I didn't interview, but I have it at one reliable remove).
Given the other stories about how they operate, I wouldn't be especially shocked if their starting offers varied wildly over time, even on no particular basis.
