Incorrect claim about what? That Apple’s chat system has very minor usage outside the US (+ Canada)? Last I checked, the majority of the population is not American… with my specific phrasing “in practice” holding true. Having a phone & having a computer are two separate things due to Google+Apple’s control. They do not want to let you use the device as a general compute device & almost nobody can use it for general compute so one could definitely prefer one & not the other since they unfortunately, in practice, are two separate categories. You should be able to chat with a phone & without a phone, with a personal computer & without–any platform that requires you must use one or the other is a bad technology.