This isn’t a Latin America problem, it’s one that exists everywhere, because of the territory agreements already described.
Switzerland is right in the middle of Europe, yet some items are very hard to get because of such agreements, which sometimes end up with Switzerland having no official distribution channel, yet distributors in neighboring countries contractually barred from exporting to here. Sometimes it even depends on the product line, with some of a manufacturer’s products being trivial to get while others are nigh on impossible.
Heck, it happens even to USA sometimes.