Off-premise sales (food not consumed in the restaurant) are the fastest and (by some estimates, only) growing segment of restaurant industry revenues. Combined, delivery and pickup (including drive-thru) are expected to eclipse $400B in the US by 2022 with third-party delivery (3PD) representing more than 10% of the total and growing in excess of 40% year-over-year.
https://medium.thanx.com/four-horsemen-restaurant-apocalypse-64947b3d9657
William Blair