I've seen this kind of things in articles posted to social media sites (Quora and Facebook, but it probably exists elsewhere). I don't have a specific example

I've seen this kind of things in articles posted to social media sites (Quora and Facebook, but it probably exists elsewhere). I don't have a specific example at hand, but it's typically an article a few paragraphs long with really strange phrasing, so strange that it's not explainable by the author not knowing English well. In a handful of cases, I've managed to find the original source. Common phrases are systematically replaced by ill-fitting synonyms. I suspect the motivation is to avoid accusations of plagiarism (though I don't know what benefit the posters derive from doing this).