I would like to add that we are talking primarily about the ability to insert a direct link with a video located on a third-party service. To do this, you need to display previews/thumbnails, which are not available now.
I may be wrong, but I don't think it will require a lot of additional resources.
Are you serious?This is what it looks like in Jerboa https://pixshare.de/images/iLzOo8.jpeg
Here's what the video display looks like on web instances.https://pixshare.de/images/iLzPDJ.jpeg