Earlier quoted context omitted.
Well, only Americans use it. There's no point in arguing about it your version of a language is better or worse but for the rest of the world it's incredibly annoying having to correct Zs with Ss when using LLMs or American only software.
I'm actually Russian. The whole world uses American English, by virtue of US dominance in all important technical and cultural spheres.
But when you look at things like the type of English being taught in school, or the language used by the government, it'll be UK/International English.