Thank you so much for the information and detailed explanations. About your ending question, I ran into this publisher during my paper readings. I can also agree that such a publisher is not a highly scientific or credible one. However, I think any recommendation against or in favor of a publication will be somehow case-dependent. In other words, not all researchers get to (or should) always publish in high ranked journals (e.g., in Science, Nature, ACS, etc.). There do are some works which are not so brilliant or massive, do not possess a very attractive topic, are not prepared by highly renowned authors (from the developing countries. e.g.), or cannot wait for a lengthy review process. In such cases, there should be some publishers or journals that more easily publish, but adhere to minimum standards. My question about this publisher was raised from such a point of view. In fact, I wondered if broad scope or repetitive theme are as inappropriate as a publication charge as an index for avoiding a specific publication or not. To sum up, I think it is inevitable that publishers and journals differ in their reviewing standards and also the review pace (ranging from 2 weeks to 2 years according to my observations).
Many thanks.