Just to clarify. RBI has banned all of its regulated entities which is nearly all of the banks in the country from rendering services to entities dealing with cryptocurrencies. This implies crypto-exchanges in the country cannot provide purchase/sale services of any digital currency against INR currency pair within India. There are very few autonomous banks that don't come under the purview of RBI but these cannot render services at scale and ergo useless for the purposes of trading cryptocurrencies.

Indian Exchanges can however continue trading crypto pairs but that's useless if people cannot enter into the markets with money or exit their positions for INR. If these exchanges move abroad they are still unable to render any Crypto/INR pair to any Indian citizen as these transactions would then be illegal under other govt policies already in place.

The government however hasn't banned cryptocurrency or trading in cryptos itself but RBIs ruling prevents most of the speculators from entering/exiting the market through legal channel-aka Indian exchanges. This will result in OTC trades which I think is fine too but the price won't be good anymore and the volumes maybe very low.

Maybe my post will clear things up a bit more if anyone is interested to learn more.

upvoting for visibility.