During 2017-18, the Indian Income Tax department sent notices to hundreds of thousands of individuals, who were suspected of dealing in crypto-currency. Here in India, the bureaucracy and red tape is so prevalent, that the recipients had to spend a good amount of money out of their pocket to hire CAs and send the reply. Almost every crypto exchange based in India was forced to shut down the operations.
they received the notices and on what grounds does the government want them to pay taxes ?
if the crypto currencies are not regulated , they cannot be treated as assets or money or anything taxable , only if converted and sold to fiat
and even then the legal area is as grey as it can be
as for the cryptoexchanges , yes they can be shut down or created such an environment that it would be impossible to operate in India
but I lived in India ,I would simply ignore any Tax department notices unless there is a certain law saying you must pay taxes on your bitcoin operations (which there are none yet as far as I know)