Plex could be becoming more like a Roku. The growing Plex Movies and TV Shows section now includes Crackle’s library. For years Plex had a listing of what it called channels, later renamed plugins. The entries were a way to access web-based content on-demand and ranged from Networks to apps and were not officially supported. As the platform got more mainstream, channels found their way off of Plex and were sort of replaced by the podcasts and web shows. But a major effort from Plex to develop ad-supported streaming on top of the other content has opened the door to channels once more.
In the past Plex had its own channel store of sorts. At the moment there is only one channel listed and it can be accessed via the movies and TV option in Plex. The default section includes all of the video selections available via Plex with Crackle listed in separate rows.