yes they have started adding it and guess what its instead benefitting the restraurants/swiggy.
For example we go to a restraurant and buy a biriyani and they charge lets say ₹200/- inclusives of GST.
At swiggy GST is added separately on that ₹200 and also generally swiggy prices are comparitively higher than direct.
So it becomes 5% of whatever the price be it ₹250 or whatever.
And now comes the loot , if you get any discount of whatever amount the gst still is on the item price and not the discounted total.
The way swiggy has implemented is simple , to restraurant guys its a benefit that they dont need to fraud and neither they need to reduce their cut ,just passed on to customers directly