Swiggy — overcharging items

Address:

560103

There is this restaurant sri udupi park,
On its menu
Idli - ₹40,
On swiggy - ₹51

Plain dosa -₹50
On swiggy -₹69

Clearly, swiggy is overcharging consumers in the disguise of delivery.
Why are their so many hidden charges?
Including delivery charges, packaging charges in addition to already overpriced food items?

I hope this gets closed soon.