Sorry for miscommunication. The site is not actual service yet. It is just showing the concept and key values of this service. And the reason why I collect the email is that I wanna validate market needs for this service and notify the opted-in people when the service is launched.
So I changed the button name to 'get notified when launched'.
I think the reason why the GP stated that is because the site requires you to provide an email and states it as a demo. I would love to look at a site like this, but I agree that there seems to be no good reason to provide an email address to see the results for a website like this.