I met someone running an AirBnB in London who was in the process of revoking his US citizenship because he was being taxed by the US despite not working there o

I met someone running an AirBnB in London who was in the process of revoking his US citizenship because he was being taxed by the US despite not working there or having any business there. What blew me away is that he was having to pay thousands of pounds to _revoke_ his citizenship. From an admittedly naïve standpoint that seems like a real rort.