New Delhi, Aug. 9 -- Two years ago, Prateek Vats, 25, quit his job as a digital marketer to start Timple Tiffin Services in east Delhi's Laxmi Nagar, a hub of coaching institutes for chartered accountancy and banking exams. He rented a place, hired four female cooks, and a delivery boy. Within a couple of months, business picked up, and he was delivering 300 tiffins every day, mostly to students living in hundreds of PG accommodations in the area....