The collectivists on the FCC...not bothered by that "legal authority" thingy...were going full-tilt toward "net neutrality" (meaning, stealing free speech and appropriating private property).
The UNANIMOUS DC Circuit (panel, I assume) vigorously reminded the demi-tyrants on the FCC, egged on by Marxist Anything BUT Free Press, that this is still...for the time, at least...a nation of laws. The FCC didn't have any legal authority to do what they were attempting.
Nobody is mistaking this as the last word, however. Marxists like Robert W. McChesney will not be discouraged by things like law.
There is a VERY well-funded (Soros) drive among the collective to end free speech in the United States. They know the stakes, and they are not going to be long deterred in their drive to that prize.