"Help" with privacy isn't enough, you need something that is bulletproof and either resistant to you screwing up the OPSEC or otherwise you have to get OPSEC right all the time.

Using the same mixer as terrorists could get you charged under anti-terrorism laws.

Before you use one I'd ask you to ask yourself if you want to be complicit in large-scale tax evasion, international sex trafficking and all sorts of awful things that make the mixer more than a game where you can imagine you're important because you're a spy or something.