[throwaway0a5e]

This comment is completely ignorant of the professional licensing requirements that serve as the hoop you must jump through before making "real money" in pretty much every blue collar field.

What you said is true about tech but a plumber or electrician that crosses borders will start at square 1. They will have to fulfill the licensing requirements in their new jurisdiction. These requirements almost always include requirements that add up to where one must work under person holding level V license before taking test W and then work X years before obtaining license Y which lets them be responsible for work type Z and there will be a corresponding requirement that all job Zs be performed by a party with license Y.

Professional licensing requirements like this are why you have experienced oral surgeons from Taiwan slapping braces on teenagers in California and expert boiler welders from Vietnam building hand railings in London.