AL’s Deli in the Mission offers delivery of its herby falafel sandwiches and smoked meat salads through the service Caviar, but something strange happened two weeks ago. Delivery drivers for a different service started arriving, demanding to know the status of their orders.

The AL’s Deli staff had a question, too: What orders?
“We don’t have order numbers, no data to track them down. We don’t know anything except some driver showing up,” said owner Aaron London. “When you have random companies sending in people blind, it shackles us.”

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“I don’t think a delivery site needs permission to purchase food from a restaurant and deliver it,” said Mark Lemley, a professor at Stanford Law School. But concerns can come up around how the relationship between apps and restaurants are conveyed to consumers, he said.