No, btc is still often used for transactions between buyers and sellers before it gets converted into monero, and most exhanges don’t sell monero so people usually buy btc and have it converted at a different site if they want to purchase with monero directly.
The online black market shifted to monero ever since the “Dreaded Pirate Roberts” was identified and arrested via his bitcoin accounts.
Dodgy people may hold bitcoin, but the don’t use it for illicit transactions.
No, btc is still often used for transactions between buyers and sellers before it gets converted into monero, and most exhanges don’t sell monero so people usually buy btc and have it converted at a different site if they want to purchase with monero directly.