I believe Teams actually uses some of the Skype architecture for video / voice calls. That may have changed in the newest versions.

The account that runs the Teams Room app is called "Skype", the default admin password is "sfb" (Skype for business), and to edit some settings you need to upload a XML called SkypeSettings.xml.

Lots of Skype remains.

If you use Teams in the browser it even shows up as part of the URL.