This service might not be for you, but there is no reason to post such a negative comment degrading someone else’s work.
I get that you're trying to be helpful. But the way you say things come through as being dismissive about other people's work. They just put in a bunch of work into it; they seem very open to getting feedback and working on it. I'm curious what you're trying to prove by calling it "crappy"?
you offer a premium package yet there is no info on any of the above? Security/privacy concerns aside you extract money yet haven't even got a vision on how to grow this (no business plan)
... I'd give this a hard pass since it seems to be just another hobby project where everything depends on a single dev but the product ultimately doesn't have a vision. (not that this would be bad - but the fact that there is no clear statement on it _while_ extracting payment leaves a first impression that is fishy, questionable and unprofessional)