cyber criminals use bitcoin as a crime payment currency, it happens when GOT is hacked. Anonymous bitcoin transactions make it the preferred method of payment for cybercriminals in blackmailing their targets.
the more criminals that use bitcoin, it does not mean that bitcoin has a bad effect, it is caused by the person using it. therefore, we must be wise in using bitcoin.
There's a lot of crime in the whole world, especially in digital country we can't notice this because were all busy in our own life. However if you see the news in different sites, you will see there's a lot of accounts were hacked, selling bodies thru internet in exchange of money or bitcoin, gambling it is also a crime. But no one can stop that due to lack of solution regarding with that problems, you know why? because digital world was so extensive.