Reddit is a forum and to a forum of enthusiasts it is a personal space.
It's more akin to a bar in which they all meet and hang out.
It's possible to research via a bar, just get to know people first and they'll embrace and support whatever you're working on. But to those who wish to just walk into a bar and start trying to perform market research or sales... yeah, know that it comes across as an invasion of personal space.
If anyone wishes to use any forum for successful launch of a project... either your product has to be that good (in which case they'll only trust an existing member saying so) or you should get to know the community first and contribute to it and be a trusted member of it.