I don't think this is related to the country of the editor. The lack of ethics is more preponderant in low-quality reviews (many junk reviews are Asian) and in

I don't think this is related to the country of the editor. The lack of ethics is more preponderant in low-quality reviews (many junk reviews are Asian) and in some domains (more in medical reviews than mathematics). Here is an example that even the highest profile journal can lack ethics: circa 2005, Nature published a paper comparing a selection of scientific articles from Wikipedia and the Encyclopedia Britannica. The editorial board of Nature selected the articles and sent them to reviewers. They only publishes metrics and a few quotes of their data (the list of selected articles and the reviews). The results were surprising and made a lot of buzz. But Britannica noted that one of these quotes was a sentence that was not it their encyclopedia. Nature had to admit that they selected some Wikipedia articles, and when they could not find the equivalent Britannica article, they sometimes built it by mixing articles and adding a few sentences of their own. Obviously, the process were totally biased, from the selection to the publication.