This is more concerning than the usual paper mills as the crap papers are published in otherwise legitimate journals. The pure paper mills are less destructive as people are much less likely to read and use those papers. But if you have ever growing numbers of crap papers mixed in regular journals that will be a problem.
If a journal is publishing "crap" then the term "otherwise legitimate" isn't helpful. The journal becomes illegitimate because you cannot trust what it has published any longer.
Unless there's some way to discriminate between the failed and successful review processes it has failed in its purpose.
