This isn’t really correct. Free Open Source Software is very much owned. It is just that the owner doesn’t charge for it, has stated that there are rules for use and modification of the software. FOSS was a clever trick that used copyright against itself. It is was a really brilliant trick, but that trick was only necessary because copyrights exist in the first place. If copyrights didn’t exist then it wouldn’t be illegal to redistribute Adobe Photoshop.

You may argue that copyrights are necessary for the betterment of society, but that is debatable. The biggest case against copyright being necessary is, in fact, the FOSS movement. It proves we don’t actually need companies like Adobe to make all our stuff and charge a lot for it.