the biggest advantage, and the only one everybody agrees on, is that bitcoin is decentralised and so extremely resistant to censorship. That has made it a haven for activities from cybercrime and drug trading to enabling international payments to closed economies and supporting radically off-grid living.
That's right , for me bitcoin can use in illegal activity because bitcoin is not that public, only you can know your account. It aslso accessible for illegal thingd. There many ways to use bitcoin in illegal but it is not right for morality.