Every time you transact with someone on Bitcoin check what public information is available about their coin history. They may not meet your high standards of keeping KYC and non KYC perfectly separated. But that's not merely it. Any future mistake or voluntary KYC interaction will doxx years of hard work. Saw it first hand how people react for the first time if you show them what is publically available for example on Arkham. Chainanalysis companies go far further. They can put a name tag to 95% of all Bitcoin transactions.