We care deeply about user privacy and have systems in place to prevent anyone (including the founders) from looking at user data. You can find our privacy policy here: https://www.greplin.com/privacy
I read the security page, and while I understand that there are "safeguards" in place to say that the founders can't read my email, I find that kind of like me saying that I can't browse porn because I installed a porn web browser filter on my PC. I have all the passwords, so I can choose to turn that off at any time.
If I sign up for your service, your servers contain plain text copies of all of my data. If it's not in plain text, then it's encrypted with a key that you hold so you can decrypt it for indexing.
I think there is a market for technology like this, but I think it would be more turnkey solutions for businesses so that they can own and monitor access to their servers and data. Is this a direction you are considering?