Food delivery services - A restaurant can either maintain its own delivery personnel or use third parties who contract with restaurants to not only deliver food orders but also assist in marketing and providing order-taking technology. The field has seen rapid growth since the late 2000s with the spread of the smart phones and apps enabling customers to order from their mobile devices. According to a study cited the New York Times, as of 2019, three companies account for nearly 80 percent of the US restaurant food delivery market: GrubHub, UberEats and Doordash. Competition for market share has been fierce, with smaller competitors either being bought out or closing down. Amazon Restaurants announced in June 2019 that it was closing its restaurant food delivery service to concentrate on grocery delivery. For example, Domino's Pizza had a commercial campaign in the 1980s and early 1990s which promised "30 minutes or it's free". This was discontinued in the United States in 1993 due to the number of lawsuits arising from accidents caused by hurried delivery drivers.