I use it primarily with my own Jellyfin instance, but there are Netflix, Disney+ and pretty much anything you can think of plugins. The YouTube irritatingly complicated to get working, but then there are "play on kodi" plugins for various browser so you can flip what you're watching to the big screen. It's really an amazing project.
Being able to play media from Jellyfin and other locations like YouTube, samba shares, etc is why I tend to use Kodi. I’m not stuck with one server/service.