I know hosting an entire sign up process and user content is not something you can just build and forget about, so my thought was that a sufficiently decent website could bundle a package that could be hosted on existing organization infrastructure. A zip file of the user's content that they could upload to dropbox/drive/sharepoint/etc. Then the consumer page would match a url slug to a package file and serve the content that way.
It's... a lot of stuff for a quick workaround project. And it's a pathology of an engineer to make solutions where solutions aren't needed. So grain of salt on any of that. But I did want to clarify since you were willing to engage with the concept, as understood. Hopefully this proposition strikes you as less concerning/illegal! I never want to steal anyone's work or infrastructure. I just believe that better alternatives - even ones borne of seeing how badly other people are doing it - can and should win out, if people ever provide them.