Gosh, I'm tired of MDPI emails asking for reviews in 10 days, or asking for papers, etc. They are terrible. I also made the mistake of reviewing for them once.

Gosh, I'm tired of MDPI emails asking for reviews in 10 days, or asking for papers, etc. They are terrible. I also made the mistake of reviewing for them once. It was a very easy review, as the paper (also mathematics) was absolute crap, and I said as much. It was published anyway, and now I'm definitely on a list. My spam box slowly accumulates more and more MDPI emails.