Because of the semi-anonymous nature of Bitcoin, its used in ransomware attacks. Hackers breach networks and hold them hostage until payment is made to them. Hospitals and schools have been victims of these types of attacks. However, unlike cash, which was favored by thieves in the past, Bitcoin always leaves a trail in the blockchain that investigators can follow.
Actualy its a big no,and this is a wrong accusation that bitcoin can be used to extort people,because it is created by satoshi nakamoto,to makes a world better and a part of technology its can help economic growth by means of capitalize country and promoting social economic responsibility and not to create extortion or scamming to the people,otherwise there are circumstances that some people or website used the name of bitcoin in order to extort or phishing.