Watch Together is a new feature that Discord is currently testing.

Users can make playlists of YouTube videos and view them together on the chat platform with Watch Together. The feature, which was first reported by The Verge, is currently only available on friends and family servers.
The feature was previously tested and is now available as Watch Together. The feature will be available by the end of October, according to the business. Users can upload videos to the server queue by using the interface to search for them or by inputting a YouTube link.

Discord just disabled music bots like Rythm and Groovy Bot, two of the most popular tools for streaming music from YouTube, Spotify, and other streaming services straight through Discord. For potential revenue from this new feature, the corporation will also include advertisements.
Source: The Verge