It's possible, if you create a complete police-state with super controlled internet, anti-crypto spy-networks, supervise the citizens 24-7 etc etc, maybe start rounding up crypto owners and put them all into camps? =/

A place like India with millions of internet cafés/places with free wifi and loads of unregistered people. Don't think that is going to happen anytime soon...

A major challenge now will be to establish the age of juveniles, which will not be easy because no more than 56.2% of India’s births were registered in 2000, according to the Civil Registration System.
Source: scroll.in

This might even increase the use of crypto in India?