I think that the basic answer is that publishing and publishing contracts is a rather archaic area with lots of rules and contracts that made sense 30 years ago, but doesn't match the new reality. If a book is not available in a given market, it's because the copyright holder either doesn't want to make it available, or it is unclear who actually owns the ebook rights in that market. Sometimes for older books, it's a case of converting a paper book to ebook format.
To use an example of an author that is mentioned in other thread, both David Eddings and his wife died several years ago. It is unclear who the copyright holder is. It might be his alma mater, or it might be a sibling or sibling's heirs.
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