That's a bad argument. Visa, MasterCard, etc. know who you're transacting with anyway. That is functionally equivalent to just paying from a Coinbase Bitcoin wallet. On the public ledger, it'll only show a transaction from a Coinbase wallet. No one would know it's you other than Coinbase and the porn provider

Woth crypto you could at least send it to your wallet, throw it through Tornado Cash, then put it in another wallet, making it extremely difficult to track

In general though, if the government wants to know who made a digital transaction, they'll be able to find out. Doesn't matter if you use a credit card or crypto

What makes Bitcoin bad as a currency is the slow, expensive transaction times