Yes exactly. Logging into a Lemmy instance (ex. Lemmy.world) account on Memmy is possible but logging into a kbin instance (ex. Kbin.social) not possible.

I’m pretty sure lemmy can see content for a kbin instance and vice versa.

Last I’ve heard is kbin has yet to provide an API to easily allow developers retrieve information. The only app I’ve heard that will work for kbin is Artemis, but currently only providing a limited access to beta.

Or we could all switch to an Open Source alternative, Jellyfin, and either donate what you’d normally pay Plex or just enjoy it for free. I’ve never used Plex and started with Jellyfin. It’s gotten the job done thus far