Why the Bitcoin bubble may explode when it pops:
One reason for regulating blockchain-based cryptocurrencies, also known as digital tokens, is the growing concern that the virtual money they represent could be used for nefarious activities, such as money laundering. Cryptocurrencies could also be a threat to the current financial system because they have at times encouraged unbridled speculation and unsecured borrowing by consumers looking for a piece of the crypot action.
Government or central bank issued, blockchained-based cryptocurrencies could be far more useful for legal transactions than the underground currencies like Bitcoin. Bitcoin is great for secret or questionable transactions that do not want to be tracked, of course, but most transactions are not in the camp.
(Note “blockchain” is an important bit of technology that has numerous applications other than cryptocurrencies.)