The majority of the world doesn't speak English, so why care about using correct English at all right? Btw American English is still the most common variant on the internet. More so than British English.
To paraphrase David Mitchell (https://www.youtube.com/watch?v=om7O0MFkmpw), the problem is not so much the prevelance of American English, which in a lot of situations makes sense. eg. "sidewalk" makes a lot of sense, perhaps more, than "pavement" for the place that a pedestrian walks at the side of a road. "Parking lot" for a lot of land that is reserved for parking etc. The issue is that "could care less" means the opposite of what people intend them to mean, and they're just expecting the people listening to interpret what they mean.
And yet here we are.
To paraphrase David Mitchell (https://www.youtube.com/watch?v=om7O0MFkmpw), the problem is not so much the prevelance of American English, which in a lot of situations makes sense. eg. "sidewalk" makes a lot of sense, perhaps more, than "pavement" for the place that a pedestrian walks at the side of a road. "Parking lot" for a lot of land that is reserved for parking etc. The issue is that "could care less" means the opposite of what people intend them to mean, and they're just expecting the people listening to interpret what they mean.