There really is no good term; GNU+Linux includes ChromeOS (TIL) and excludes Alpine (and derivatives like PostmarketOS), "Desktop" doesn't jive with Mobian (for Linux mobile devices), and "Linux" includes Android.

User-controlled might be the best I've seen so far, which is really saying something - all it's missing is what happens when it's issued (and administered) by a school or other org.

Now I'm gonna be rolling around phrases like "libre-encouraging Linux" in my head the next few days.