i agree but the pain is transitory. no business likes someone else talking a huge chunk of their revenues and hence the pushback.A lot of retailers dont like amazon but its the customer who decides whre to shop.Mcdonalds,dominos n some other cloud kitchen chains have their own app but most customers dont want 20 different food apps on their phones when they know they ll be ordering from a particular restaurant once in a while. sure some chains are increasing their customer reach thru their app but loyalty to any restaurant chain is temporary in most cases(ppl get bored) however customer stickiness on a zomato or swiggy app that provides more convenience,variety and better customer experience is high. truth is most restaurants have benefited immensely from the likes of zomato n swiggy. there are so many people who order a lot more today(specially in tier 2 tier 3) just because of them. moreover a dine-in restaurant caters to delivery orders on marginal cost basis(might need an extra hand or 2 in the kitchen to cater to deliveries).so think of delivery as bonus to a restaurant which is mostly focused on dine in revenue. just my thoughts 
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