There's very weird language at the end of the GPL: "The GNU General Public License does not permit incorporating your program into proprietary programs." This

There's very weird language at the end of the GPL: "The GNU General Public License does not permit incorporating your program into proprietary programs." This is bizarre because "you" is defined as "each licensee," not "each licensor." It's also contradictory with the definition of "work based on the program," which only applies to works that use the program "in a fashion requiring copyright permission" -- which dynamic linking does not. It's also hopelessly vague. What does proprietary mean here? There's no definition, and the common definition is simply that it describes something owned by someone... which includes every GPL'd program ever.