Interesting that it isn't about the quality, review process, etc, but rather about deceptive practices in getting researchers to submit articles: Their defense is "fake news"
Apparently, lots of these predatory journals have clever tricks to make them look "legit". For example, including superfluous citations of their own journals' article - to make the impact factor (journal citation rates) look bigger.
As far as I can see this is a bit of humbug. All this started with the mainstream journals doing much the same. I remember being hit for unexpected page charges by the premier rheumatology journal twenty years ago. There are no good guys in this business. The academic community only has itself to blame.
Someone else pointed out a few years ago that a lot of articles in the Journal of Psychosomatic Research seemed to have superfluous references of work by the journal's editor.