What is the deal with the "stop stealing" on the gallery?

I think the issue people have with it is downloading a creation, changing one or two things and then uploading as your own and not even crediting the original uploader.

If I upload a house and someone re uploaded the same thing without credit, I'd be pretty mad.

If someone took my house, unfurnished it and completely redesigned the wallpaper, the floors, the furniture etc, then I probably wouldn't care.