However, Twitch differed from other streaming service watch parties. It wasn't intended to view movies with people you know but as a way for streamers to connect with fans over a good movie or show. A Twitch streamer just had to connect to Amazon Prime, pick a Prime Video (not something purchased or rented), and then get streaming. It was a great alternative to watching someone play a game, and in some ways, allowed the streamers to focus more on chatting with fans. "Was" being the key word as Twitch Watch Parties are coming to an end.
https://www.pcmag.com/news/twitch-will-end-watch-parties-on-april-2