Rwanda is a pint-sized dictatorship governed with an iron first. Delhi is a howling cesspit of chaos.

In addition to the obvious enforcement problems in Delhi itself, Delhi is only a small part of the National Capital Region, meaning tons of plastic will flow in from Haryana and UP even if Delhi does manage to clean up its act.

I think one reason could be because Delhi doesn't have it's own border control? But yea I get it, there are lots of things that can be done to enforce it.