Yes, nowadays its being used in crime, they buy and sell online and pay by bitcoin. Because its untraceable. So police cant get clue to caught them. I think its dangerous.
Dont assume this. yes, bitcoin has been used for crime since its inception. but the blockchain is very readable, due to the fact that most of us have to use some kind of a n exchange to convert value to fiat. these exchanges know who we are, so once you touch an exchange account with a series of transactions from your original wallet, then you dont know if you identity has been compromised, or will be under scrutiny.
so you know what is out there:
https://www.chainalysis.com/
https://techcrunch.com/2016/03/21/elliptic-takes-in-5m-for-its-blockchain-forensics-tool/
https://news.bitcoin.com/osforensics-founder-explains-his-bitcoin-transaction-monitoring-tool/
always take the time to understand
