I suspect that part of the problem is rights clearance. Canada has a very complex right clearance, it has to be done on a title by title basis (US related rights versus UK related rights.) I don't know, and don't know how to look up, the rights available through the publishers for each country in the world. So publishers may only have rights to certain countries, or only a title list of available titles that the publisher has the rights to. In addition, local censorship issues may be involved. I expect that Amazon, as a ebook seller, does not want to deal with any title-by-title basis, whatever the reason, rather than just being able to sell anything by the publisher in a country where the publisher has rights.
This is all surmise, of course...
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