The stupid thing is I can leave bitcoin in my wallet at home. Cross the border into the United States with zero bitcoin in my phone wallet. Access my home computer remotely once in the US. Send my wallet phone in excess of $10,000 bitcoin.
When I'm crossing the border I can be totally truthful and state I am not carrying more than 10K worth of currency.
From what I was told from your Americans is that you can't do that because your country reads your email so you can't do that if you do then you go to jail. You are no longer free like your granddaddy was. Sorry Americans.