I don't think you can escape it by simply throwing up a firewall to try to block EU users. It seems that you're just inextricably pulled into this as soon as yo

I don't think you can escape it by simply throwing up a firewall to try to block EU users. It seems that you're just inextricably pulled into this as soon as you record any data about an EU citizen. Unfortunately you can't know with good certainty whether or not that has happened.