Theyre attractive to criminals due to the pseudo-anonymity created by cryptography and a peer-to-peer architecture provided by blockchain technology. Regulating the industry is necessary because it removes an intelligence black spot thats exploited by criminals. Digital currencies including cryptocurrencies such as Bitcoin, Ethereum, and Ripple, these can pose numerous security challenges for governments.
Because it's a kind of thing that is not infinite and has a limited numbers only. Regulating it means taking care of it properly so that we can have it for so long. Abusing digital money will lead to it's scarcity which is bad for all of us. Everyone here is responsible of digital money 'cause we're all in this together so it must be regulated for the cause of all.