US is a funny place, you can't transfer from one international flight to another without entering the country.

So flying from UK to Mexico with a stop in Miami will involve immigration and all the jazz in Miami (including the need for a visa if your passport normally requires it).

This is usually not the case in Europe. You stay in the non-schengen transfer zone and walk from one gate to another.

Even without formal immigration controls for transfer passengers I'm sure the European authorities are quite capable of consulting the flight manifests and arresting you in transit if they desire.

And if ETIAS ever goes live, they’ll be pre-clearing just about everyone before they get on the plane.

Much of Coinbase’s operations are located in Miami. If I recall correctly, this individual has been residing in Miami for ~ a year….