And we can blame the mixers. Its only used by and only designed for criminals. That's their whole business module. People running mixers got all arrested in the past, now sentencing over 10 years in federal prison.
You can not blame on them.
Did you know the history or Nobel prize and the career of Alfred Nobel
[1]. You can not blame on him when you see terrorists use gun, gun power to kill innocent people. It is not the fault from Nobel, never.
Mixers are the same. They give users privacy but they are opened for anyone on the planet to use. You can use them or ignore/ reject them. It is your decision.