I am a member of the Cloud. When I downloaded Adobe Acrobat I also got Form Central. I created a form and put it into a site. When I clicked the submit button I got the following response..
Thank you for completing the form and below that was an advertisement for someone to try Form Central.
Is there a way to delete the ad. Some clients are not going to want that on their website.
Unfortunately FormsCentral is not included in the Creative Cloud subscription (you can vote for the idea here : http://forums.adobe.com/ideas/2328)
If the author of the form has a paid FormsCentral subscription then there is no FormsCentral ad on the Confirmation page.