US keyboards are too limited in Europe
They're more common than you'd think, whenever I do a quick search for mechanical keyboards most stuff I find is ANSI only. Kind of nuts given the population of europe is 1.5x the population of the US but given there's at least 10 different variations of the ISO layout across Europe I guess they'd rather throw the towel and just try to push ANSI and hope people buy it anyway (which a lot do to my disbelief).
Personally I don't mind buying whatever regional ISO layout is available, I can live and i'm already used to having misplaced symbols anyway, but I refuse to buy anything that's not ISO