We broadly aim to be legal worldwide since it's not very cool if we get outlawed in e.g. Australia and businesses there can't use OpenStreetMap for anything, can't download OsmAnd there, MapComplete is blocked from browsers, etc. Incorporating in the EU was actually a consideration due to Brexit (don't remember the reasons) but it sounds like the benefits didn't outweigh the effort of moving, seeing as it hasn't happened

Interesting though that there's this different (15 years) term where normal copyright is just about forever. That's going to come in handy somewhere for datahoarder me I'm sure :D