People thought they could beat the system by placing a Mobile Order at Contempo Cafe at the Contemporary. They thought they could Uber/Lyft to the Contemporary. If the guard at the Contemporary tried to stop the Uber/Lyft from entering hotel property, they could show the mobile order on their phone. Then they would walk into the hotel and cancel the mobile order.
Disney decided to put a stop to that. If you try to Mobile Order from the Contempo Cafe at the Contemporary, you get this message in
MDE:
Important Information
At this time mobile ordering from Contempo Cafe is only available to Guests staying at Disney's Contemporary Resort and Bay Lake Tower.
You get the same message in MDE if you try to place a mobile order from the Wave... of American Flavors at the Contemporary.
I thought I had read that you would get a similar message if trying to mobile order from the Grand Floridian. But I just checked Gasparilla Island Grill at the Grand Floridian and I don't get that pop up message.
But I don't know that if you Uber/Lyft to the Grand Floridian, the guard will let you in if you have a mobile order from Gasparilla Island Grill on your phone. (On the other hand, I don't know if the guard would try to stop you at all.)