https://www.deepdotweb.com/2016/01/23/bitcoin-playing-an-increased-role-in-crime-europol-says/Would you believe that the existence of bitcoin has increased the number of criminality in some countries in the world. This is the issue that was being thrown by the EuroPol and the UK Metropolitan Police. According to them bitcoin has played a huge role on the increasing criminality in their area. They added that a huge number of cybercriminals were using bitcoins in their activities.
This just shows that as bitcoin develops both advantages and disadvantages will tag along.
Heads and tail, the two sides of each coin. In a similar manner if anything has numerous advantages then it too possess disadvantages also and the so with BTC. BTC is boon for the humanity but due to its decentralization, it often engaged in several criminal activities including serious threat like terrorism and that is the reason why several countries had complained about BTC as being use for criminal activities. So in the future centralization of BTC is very much necessary.