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Not true of joins, p2p sure but it's irrelevant scale.
The further you get from a KYC exchange in actual usage the less the attribution signal
If people are just withdrawing -> reciever -> exchange then sure, but add one organic middle receiver and that breaks down. When you actually use coin for commercial activity, every time it changes hands, it becomes less attributable.
Coinjoins are just recycling, not actual usage. Coin in Coin out is obvious because of the recycling, and draws attention all it's own because of the paradox.
There is no shortcut, no coordinator making a vig or crypto-theater solves this problem. It'll only be solved by lightning and real economic activity... And even then really only for individuals and medium businesses, state or institutional level movements are transparent by design, the privacy balance has flipped.
If there were no coinjoins or p2p exchanges the whole chain would eventually be surveiled. That wouldn't be ideal, so I'm glad that the tools are there for us to use. Of course it doesn't mean you can simply do a coinjoin and think that the job is done. There's a lot more to be cautious of like exposing your xpub to a public node or consolidating utxos.