The third option being considered was "to let it implode and make it systemically irrelevant". The underlying instability and riskiness will ultimately prevent the sector from growing, RBI said.
This, too, had several risks as crypto may become more interconnected with mainstream finance and divert financing away from traditional finance with a broader effect on the real economy, the report added.
'Design appropriate policy approach'
RBI further said that policymakers must design an appropriate policy approach to mitigate financial stability risks and promote "responsible innovation".
"In this context, under India's G20 presidency, one of the priorities is to develop a framework for global regulation, including the possibility of prohibition of unbacked crypto assets, stablecoins and decentralised finance (Defi)", it said.