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 Bitcoin blockchain is transparent, therefore you can specifically identify UTXOs. Tracing transactions and using heuristics you can somewhat reliably (slippery slope...) trace those UTXOs as they are split up and consolidated. Mixing is one way to obsficate flagged UTXOs by combining them with clean UTXOs before splitting them back out again, which is why governments are cracking down on mixing services like samurai. 
 Atomic swap with XMR in Cake. Safer and lower fees than faggy tumblers.