Kaustubh Katdare
I think it will never be illegal. The netbanking thing is all virtual and no 'real' money is transferred between the banks.
Buying a bitcoin is risky. You buy a bitcoin from say INR 10000 and then lose interest which you would have otherwise earned from bank term deposit.
Also, as there is no regulation, you cannot predict what will become of the value of Bitcoin. Today it is highest rated so called currency. Tomorrow it may be zero.
The same is not a case with rupee, dollar, yen, yuan etc. These are tradable commodities and their appreciation and depreciation has a logic unlike Bitcoin.
However in my opinion, getting a bitcoin is not illegal. You correctly said as it is synonymous to buying a gift card. The Reserve Bank of India has only issued a warning to trade carefully in the unregulated money market. The matter is under review. You may like to read this- #-Link-Snipped-#
P.S: Do not refer to RBI as
Central bank, it may be confused with central bank of India (In your founding post).
Central bank of India is only a consumer bank. Reserve bank of India is a regulatory bank.