In bitcoin's pyramid scheme, criminals have exploited the greed of people's ignorance and dreams of the currency. The essence of pyramid selling is a ponzi scheme, where a bitcoin is not fundamentally different from a tulip or a box of cosmetics.
In the event of an hacker blackmail, criminals use the anonymity of the currency, trying to escape legal sanction, COINS and cash here, there is no essential difference between just more convenient, lower cost.
In money laundering, drug trafficking, and terrorist crimes, criminals use the anonymity and high mobility of bitcoin to hide the flow of funds, which is the same as the effect of using cash.
In the event of an hacker blackmail, criminals use the anonymity of the currency, trying to escape legal sanction, COINS and cash here, there is no essential difference between just more convenient, lower cost.
In money laundering, drug trafficking, and terrorist crimes, criminals use the anonymity and high mobility of bitcoin to hide the flow of funds, which is the same as the effect of using cash.
Some people might be using bitcoins for criminal purpose but you cannot name it a criminal tool because of that. Some people also use cash for illegal activities, will you stop using it as well ?