Personally- if I have plausible deniability and legitimately have no idea where the money is coming from and have no contact with the "business" or "clients" then I'd entertain it.
I'd answer NO, particularly by reference to the above. If I need deniability to escape liability and can't contact the stakeholders, then I have no leverage that would allow me to receive any or all of my investment back, let alone any potential gains. And I wouldn't want the risk of being prosecuted if the illegal business got shut down.