ooo, but using the Fetch API requires users to open devtools and right-click something in the network tab, which is surely beyond the grasp of anyone with 5 minutes and Google /s :<
Most people see websites as they see movies: they type facebook.com and hey, an image. Enter login and password and enter and hey, another image.
The fact that things are built on top of other things (websites -> html and assets) is deep magic.