In article ,
Peter wrote:

a) existing receivers will not be able to receive the signal, and the
US one is free and works

The Europeans and the US have always had different ideas about charging for
navigation services. Back in the 60s (50s?), while the US was building
Loran (free for anybody to use), the Europeans were building DECCA
(available for a fee). In the US, anybody can reprint government charts.
In the UK (for example), charts carry a Crown Copyright. It's not
surprising the same pattern has been followed for GPS.