No, it wasn't.
"Later it was tossed over the wall and adopted by KDE for reasons unknown to man kind."
It was never "tossed over the wall", nor was it "adopted by KDE". It was created by KDE for KDE.
https://qt-project.org/products/licensingQt is licensed under a commercial and open source license (GNU Lesser General Public License version 2.1).
Even for a troll like you this shouldn't be hard to understand, but I am not expecting anything from you.
It's the same way of adoption as it is done with webkit. Now let me try to apply your logic: webkit is not free software, because otherwise Digia would not have merged it into Qt. Gnome heavily integrates with webkit-gtk, which also incorporates webkit (that apple crap, you know). Now you also can say, that gnome uses f** non-free software. Agreed?
And if you know so much about phonons history, you also should know that phonon actually was developed by kde developers to get away with relying on one solution for audio (just remember arts). As it turned out to be quite good Qt decided to make it available for everyone using qt and bundled it. They merged kdes phonon from time to time to stay up2date.