For me it's a fairly good platform, features are nice. And yes, I also believe some mails or comments were from people that work for N1M, but not all. So far, it's ok for me and works as it should. Just support should be more active. This is not ideal.
Update July 20th, 2020: I actually did get some support now. This is good. It makes the platform more trustworthy.
Update 2: I don't understand the many negative comments here: I get many subscribers via this site, and I get true feedback, what pieces they like, wat kind of music I should produce more, etc. I can't imagine all those feedback email addresses are being faked. This is actually impossible as per current legislation in many countries of the world. Some people actually do buy my music, AFTER having checked me out on N1M.
And one other thing: I have friends and interested people who ask me for a link with some demos, and I often give them my N1M link, it's easy and streaming quality is good. There's a separate volume slider within the player. So, very definitely, this site is NOT a total fraud, not for me. It's actually what you make out of it.