P2P buyers/sellers don't care about the history of your coins until they want to send their coins to exchangers and then the centralized exchangers will block/lock their accounts. But that won’t be your problem anymore, right? It seems to me that this is not a solution to the problem itself, but shifting responsibility onto others. The funny thing (or not?) is that you, too, may find yourself in the place of that poor fellow (they will send you tagged coins from the mixer) and without knowing it you will lose (you may lose) money in a banned account of an exchange or other currency exchange service. Bestchange (as an aggregator of exchangers) has also become more attentive to incoming coins recently and provides the opportunity to check AML (aml and amlmarks), where mixers are also among the potential methods of money laundering.