Your hn demo is super interesting. It would be cool to see designers fix popular websites (cough reddit) and then be able to release those changes to the public.
It would actually be excellent "tool/side-project marketing" (like unsplash.com was for crew.co). If you set up a demo page like that, gave access to certain designers, and let them use your tool for free to showcase their redesigns of major sites.
Curious as to how the legal end would work re: IP. If you have 1,000 people redesigning Reddit and publishing it for all to see, there's bound to be some serious design overlap (whether intentional or not) when said company eventually goes through a redesign.