I intend absolutely no offense here. I love seeing HN projects posted here. But...
One of the major issues that has been raised recently is, essentially, trust. Especially in the market that you'd be targeting -- individuals that no longer trust various online services.
You can say that you will fight requests as much as possible under law, but how is that different from what Google, Facebook, and others claim to do?
The NYTimes just published an article claiming that Skype was backdoored by the NSA in cooperation with a small team of Skype developers, in secret, back in 2011. For the sort of people that are concerned by that sort of news, how are you going to convince them that you're different?