Is there any reason the "upload files" page doesn't say explicitly
"You may upload files here for the sole purpose of using them in the Wikipedia, an open content online encyclopedia. Uploading files for any other purpose is not permitted. The files will be deleted, and persistent abusers of this facility will have their IP banned."
or something to that effect? If you go straight to the page, there's nothing to explicitly say "This is only for the Wikipedia".