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.
I think the reason has little to do with investors and more to do the bitcoin being the backbone of the online black market.
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.
That may be true for a few markeplaces, but zero of the ones I have seen. All BTC.