Why Zerodha doesn't offer MTF facility for Delivery/BTST trade?

Zerodha no doubt the best broker in India but I can’t understand why it doesn’t offer margin trading facility for BTST or delivery trade. Many broker provides this facility so I think there is no legal issue here. I am using edelweiss only because they offer MTF facility for BTST even their trade station is 100 times worst than the Zerodha.

Of course zerodha can ask for POA who wants to trade with MTF. And I don’t think anyone will have any problem with it looking at Zerodha’s reputation. And in this process Zerodha also can earn intrest. I didn’t find any logical reason why Zerodha doesn’t have that feature till date. Am i missing something?