Thanks for the data! I had heard the lease terms were for 3 years, no exceptions and no getting out of them. Still, they may change from location to location and over time. As always, read the contract!
My original source for the cancellation terms was an Uber driver, and I just looked on Uber's web site, which more or less seems to confirm this:
"Flexible leases from Xchange Leasing, LLC are potentially up
to 36 months with the flexibility to return the vehicle as
early as 30 days after the first payment due date with a
payment of a $250 disposition fee. Not all applicants will
qualify for this program. Certain items present on your
credit report, and other information, may cause you to be
excluded from this offer, including without limitation, a
repossessed vehicle within the last 12 months, a pending
bankruptcy, or a discharged bankruptcy within the last 12
months."