MDPI

I do not publish in MDPI journals. A journal like Sustainability has some interesting papers published (and I once saw a thematically interesting call for papers to a special issue), but if you look at how many special issue calls they currently have (hundreds), it looks absurd. Check the online form for signaling interest in editing a special issue, and you see that they do not even require your CV (sending your CV is optional). And the editorial board counts about 1.500 people. Also, authors are invited to suggest who can peer-review their article. None of this is reassuring to me with regard to professional academic publishing.