"Bitcoin is losing its luster with some of its earliest and most avid fans (criminals too) giving rise to a new breed of virtual currency"
"Privacy coins such as monero, designed to avoid tracking, have climbed faster over the past two months as law enforcers adopt software tools to monitor people using bitcoin"
Quoted from: https://www.bloomberg.com/news/articles/2018-01-02/criminal-underworld-is-dropping-bitcoin-for-another-currency
Definitely an interesting read