Streaming Sync / Automatic Tracking Expansion - Free / Library Services

I know stream sync is still in beta, however, I’m not sure what can be expected moving forward. It would be nice to see the addition of services with decent free catalogues (Plex, Pluto, Tubi) and that offer library rentals (Kanopy and Hoopla). I was hoping Plex, Pluto, and Tubi would be tracked through my Apple TV account, seeing as my Apple TV account tracks those services, but stream sync does not seem to work that way.