Any US person who has interacted with Tornado Cash after the OFAC designation has commited a felony (IEEPA violation). That means all funds tracable to it can

Any US person who has interacted with Tornado Cash after the OFAC designation has commited a felony (IEEPA violation). That means all funds tracable to it can be subject to forfeiture, and if you are directly receiving amounts of money from Tornado that substantially exceed your income for the past couple years you make the governments forfeiture case even easier. You are right that they may not be able to charge you with the initial crime. That is why you would want to leave the US for a jurisdiction that doesn’t care about those kind of things and work with people who aren’t regulated.