my hunch would be that they tied it to snapdragon, I believe only the US got snapdragon?
it would seem to be on purpose , samsung seems to try to hamper grey market imports, maybe at the command of US carriers - since that is the only real sanctioned way to buy one here. perhaps it is about the locked bootloader on snapdragon? samsung doesnt want people with unlockable exynos fiddling with samsung pay looking for vulnerabilities? who knows, but IMO it is intentional
apples use of the secure enclave for apple pay is more ideal for security. jailbreaking has no effect on its use. Maybe samsung was too scared to lock the whole world down? It's hard for me to believe they still care about leaving it open, but if they werent going to offer samsung pay worldwide as the tradeoff.. maybe it would indeed piss enough geeks off
Just throwing it out there, who knows