Nobody uses Monero, not even most criminals who require its privacy. Consider that over 90% of all darkweb marketplace volume is in BTC. Most ransomware ransoms are bitcoin. BTC is used as a leg in most crypto laundering schemes, and in most Monero swaps when an XMR holder needs to acquire fiat. BTC's various privacy tools are plenty good—for those that actually use them. Also, anonymity doesn't mean anything when you order from Amazon or Pizza Hut and have to provide a shipping address. It's meaningless when you pay car insurance, a utility, or medical bill.

Blockchain forensics grossly overestimate their abilities to "deanonymize" transactions so they can sell their forensic vaporware to governments. And if a person doesn't ultimately use a CEX, there's nothing to be done without expending enormous resources for discovery and a conviction. And as the protocol acquires more and more global users, the data set spikes, and the price and difficuty of the unmasking becomes almost unmanageable, unless you're hunting Bin Laden or El Chapo.

With the layered bitcoin network, the many DEXs servicing both layers, coinjoins, submarine swaps, etc, bitcoin doesn't need a cumbersome Drivechain fork for privacy.