You're completely right, and my apologies. We're not quite ready to take on more users at the moment - to clarify, the signup on the homepage doesn't give us access to your account, it simply registers your interest. We've been hard at work on the product, so we held off on working on the landing page, but we absolutely will have a demo along with more information in the near future.
I quite agree that it takes trust. We do have a demo up for a safe hands-on with the product (demo.fluent.io). We certainly take your privacy seriously. Here's a bit more on that: http://fluent.io/privacy.html