I don't think this is a sustainable practice, people will figure out, start putting negative reviews and all together avoiding such establishments
As such there's no compulsion for restaurants to go on platforms like eazydiner and dineout, they go there out of their own volition to get more patrons, if it's not viable they can simply delist from such platforms
Here in vizag, majority of places on Eazydiner are the one's who are either four/five star hotel restaurants(already inflated prices for everyone) or cafés that don't have much business as it is,
Restaurants with already lines waiting outside don't bother with it