Sorry I misunderstood, no I don’t use cash for Robosats transaction (just in my daily life) which is obviously not perfect in term of privacy with third parties involved (bank, Robosats itself). But as you said using the Lightning network over Tor make it almost impossible (if you are not a researched criminal by NSA) to link a transaction to a Bitcoin adress. And their isn’t absolute proof that you even bought those coins.

I actually send the money with app like Revolut or N26 or others, so it’s the job of the bank to investigate on their customers. From my point of view I’m just paying friends back for restaurant they paid me, without knowing their behaviors good or bad.