Well, the cheap labour and high urban densities do seem to make India ripe for this.

Key to zapmeals in our world of expensive labour is that it fills the gap for the starting chef, not yet at the level where they can open a full time restaurant or catering business with dedicated kitchen and established customer base to give them economies of scale. The starting chef has the advantage of free workspace (their own kitchen) but does not, unless information tech can deliver it, have the economies of scale in buying ingredients, preparing dishes and marketing to customers.