I am not a lawyer and I do not know the constitution of India but I believe that the central bank of India has competence to ban cryptos, they may argue that cryptos are dangerous and can be used for money laundering and from what I read in January of this year the finance ministry of India has accused bitcoin of being a ponzi scheme... I do not want to be pessimistic here, but I doubt that this current situation in India could change this year, maybe next year they will change their vision in relation to bitcoin and altcoins