Because most people aren’t using the files as stored in the download folder. They’re renaming it, moving it to another folder, and deleting all the extra files. So you’d have to store it twice basically.

But if it’s a public instance and they’re just scraping the public website content they haven’t agreed to the terms of use and it probably doesn’t have any teeth? Besides it’s meta so what would one do anyway? Their lawyers will just drain your finances on court fees and continuances.