Will not change anything if you legalize or make it illegal. You cannt stop transactions, you cannt trace transactions and lets face it, there is a massive amount of black money in your country with an equally massive informal economy. There are too many people ready to exchange crypto, in large and in small chunks. There is nothing India can do to stop it. Making it illegal stops India from realizing its benefits (like taxing gains on crypto). I think your government knew which side of the bread is the butter.
Better be ready for hundi and hawala over NFT!!