I'm not one to judge because I enjoy it a lot but I think that rather than one reason it might be about a few small ones combined - it's not Japanese and not Korean so not a style most people are used to, the art quality is below average which is probably a turn off for a lot of people (like those people that think that OPM is about art), theme is sci-fi with trans-humanism elements which goes against "normal" and, well, the name isn't great. If you compare it to something like Made in ChAbyss which sounds good and intriguing or one of those obscenely long Japanese manga names, a generic name like I, The Female Robot isn't going to attract attention.
edit: saying that, 1000+ followers isn't actually bad.