Sure, but so can cruise control. So I am being a bit rhetorical in that I know they think that the fact you can turn it on and get some basic stuff out of it everywhere somehow implies it works everywhere, except for the fact it doesn't work.
I believe this confusion comes because Autopilot (ADAS) is super different from self-driving. With ADAS, you judge it by what it's able to do, like "Look, it was able to do this turn!" That makes sense because it is not intended to do the whole task, and you are there to do the things it can't do. So Autopilot works on all highways, even though you have to watch and intervene.
With a self driving system, "works" means it can actually self-drive. That you could be asleep. You judge a self-driving system on what it can't do, not what it can. If it does the turn 999 times and fails it once, then it can't do the turn. That's a bit foreign to those not used to the problem, but they have to learn to adjust the vocabulary. As such there is nowhere that Tesla FSD works as a self-driving system, and nowhere that it is even remotely close to being able to see a self-driving system far off in the distance. So yes, it tries to do that everywhere.
MobilEye in their demonstration of a nearly-working self-driving system, sent 2 people and a car to Munich for 2 weeks, and it was nearly working there too, or so they claim. That's a better claim on being close to working everywhere, if they can really pull that off. Well, everywhere that there are cars driving the roads with EQ4s, which is much of the world.
FSD doesn't work everywhere, it fails everywhere. But something makes people not understand the difference.