The particular type of fraud described here (paper mills etc.) is less common in the U.S. (different types of fraud may exist but that's more subtle and complex). There tend to be specific geographic clusters associated with this behavior that have to do with how university expansions have been done in many countries.

Oddly enough, pre-LLMs, I would have said most of these crap paper mill papers didn't really affect the actual fields. Yes, they cited each other but outside the citation ring didn't really alter the field in a knowledge sense. But now.. if these get picked up in Deep Research it's a problem.