Dabbawalas are more involved with transporting home cooked food to the worker. The worker leaves early in the morning and some time later the spouse will have a hot meal packed up. The dabbawala will come pick it up and aggregate orders going to common destinations, move it by train, etc. I presume Swiggy is only for restaurant cooked food.

Secondly the dabbawala jobs are more like a stable union job. You don't get the top money but everyone looks after each other. Of course with time customer preferences may change towards restaurant food. Or maybe workers start using plastic containers and microwaves.