Everyone partners with Uber, it’s integrated into the United app and American had a promo. Presumably they’re earning off rides. Three hotel chains — Starwood, Hilton, and IHG — partner with Uber. But only Starwood’s partnership is worthwhile.
IHG and Hilton offer ‘ride reminders’ so that when you’re leaving the hotel you’ll remember that you need transportation to wherever you’re going. However with Starwood’s tie-in you actually earn Starpoints for riding Uber.