Countries claim juristiction for thing outside their borders all the time. however they place a much higher bar on what they claim. Lemonaid stands are likely safe, but even if it is legal where you live the US will claim pedopillia laws aganst you they can get you.

part of the high bar is claiming juristriction requires sending your army. (Sanctions are often used too which might or might not work). That is why the threat is if the directors travel to the uk - that gives them sone power - but still expect US government to do 'things' if the arrest any US citizen on this.