I've read a number of these studies. My thoughts are that a number of them have confounders which are not well controlled for, and they often have limited statistical power, representation issues, or other technical faults which impact their expected validity. Further, in most cases, reproduction of the study is generally not possible. In any case, individual studies simply listed supporting a particular conclusion particularly without a listing of similar studies which present opposite conclusions - and a direct comparison therein - does not a metastudy make. What's attempted here is a metastudy and, as a metastudy, it's quite lacking.