Cryptocurrency is actually something that cannot be regulated by anyone, and we ourselves will manage it.  However, if a country legalizes Cryptocurrencies as a means of payment, of course there will be many regulations against Crypto that will be published. 
But if that's the case, I think the rules given by the government will not damage the decentralized nature of Cryptocurrencies. Instead, it will increase its popularity, and the effect is that people will be more confident in Cryptocurrencies.