> Reply to a video with a comment mentioning u/savevideo and you'll get a response in a few minutes with a link.
Not anymore, they've banned it.
No they haven't. It voluntarily and temporarily shut down. Someone was pretending to represent Reddit threatened to sue u/savevideo, but Reddit admins stepped in and confirmed it wasn't them and that they don't have anything against u/savevideo
As for an official paid feature: as soon as they start collecting money for video related features, the video creators will start circling for their cut of the revenue.