It is complicated. Some journals have a decent quality, some are just publication-cliques nests, others will publish almost anything as long as you pay. Also MD

It is complicated. Some journals have a decent quality, some are just publication-cliques nests, others will publish almost anything as long as you pay. Also MDPI never took position relative to their president verbal diarrhea on mailing lists. Definitively not an ethical publisher, but how many ethical publishers are out there?