There's one food delivery trend, however, that hasn't gone along for the ride: ghost kitchens. Euromonitor International estimated that the ghost kitchen industry could reach a market size of $1 trillion by 2030. Companies such as Wendy's, Ruby Tuesday, TGI Fridays and Wingstop all joined the wave of ghost kitchens. Consumers complained about the clandestine nature of ghost kitchens, and food delivery apps shuttered thousands of the virtual kitchens. Then consumers shifted back to brick-and-mortar restaurants in droves, forcing investor pullback and mass closures of ghost kitchens.

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Persons: hasn't, Ruby, Evert Gruyaert, Camilla Opperman, Nimbus Organizations: Euromonitor International, Big, Deloitte Locations: New York City