The reasoning would most likely be that they want a place to have it so that you don’t just accidentally delete it which is easier to do with google drive over YouTube but would’d have to talk to the mod who rejected it about it.

You can always upload the video to YouTube unlisted so that you need the link which’d act the same as uploading it to google drive with a shareable link.

It’s also likely easier to retime the video from YouTube as opposed to Google Drive.

@Pear Not necessarily if one uses a tool like SPRT, which still works.