For low amounts, you can use fake data on an exchange and still trade your xmr to bitcoin and then send the bitcoin to the dark market. Makes it incredibly hard to track you, especially if you use VPN on top of it.
if this exchange is not in your own country but really far away, no one will track your bitcoins
Bitcoin is indeed safe for transactions, but that does not mean we use for illegal transactions, let's make bitcoin for legal and investment only