The idea that students should be free to choose their own topics is...odd. You choose your topics based on choosing your lab and the projects on offer - at least in science.
The observations from the author in the comments section that they know people who want to do a PhD (in Arts/Humanities) but can't because they can't find an offered project seems more like the system working properly - professors, who can be presumed to be aware of their field and by extension national interests via grants, offer projects to hopefully efficiently allocate the research dollars of the nation.
Which leads back to my first paragraph: in science I really don't know what you'd get out of students making up their own projects in a vacuum. Which makes me think the author has a very narrow perspective on PhD research.