I'm pretty sure they meant, can the videos be accessed as files in the filesystem, which to my knowledge they cannot.

Shit like that should be illegal. I.e. netflix’s downloads expire after 30 days.

Shit? Illegal? It's literally your right on videos like <https://www.youtube.com/watch?v=JSEJApMIrLU>. Expand the description and see at the bottom: license is set to creative commons. The copyright holder permits everyone to remix the video but youtube still does not show a button for you to actually make use of that

You need to breach the terms of service (use a downloader) to exercise the rights of the content license that youtube supports