Let me rephrase so there's no pedantic gotcha: Overwhelmingly the most common way people can be identified by address is via fiat on ramps and off ramps. The agorist selling me soap and fucking beef jerky is not giving my info to the CIA, Square, Strike, and Coinbase are. Better? Okay. Ready? The shop can just not tie the transaction to the data! Example: For reporting purposes- the shop sold 15 widgets. The customer data is a separate ephemeral database. NO MATTER WHAT MONEY YOU USE THIS IS TRUE. Yes, including Monero. So, what's your point here? That using money is a public act (like I said). Or obscurity is a technique not part of the protocol because no matter the protocol the counterparty needs to be trusted? (Also like I said) In a mass adoption world if I got bitcoin, sent it to a single spend (non-deterministic) address and handed the keys to the shop owner where's the paper trail? This is a TECHNIQUE yet I preserve my anonymity. (again, something I said before)