Spot on! So much silly engineering would be needed to make this even slightly make sense for normal Linux 'users' and even then, if you can be root then there is no limit!? root can do anything as any user, right? And it's definitely expected that the system admin (ie yourself for your own computer!) can become root!!

I'm glad I'm on a source distribution (Gentoo, even though it does require patience) so I could in-theory edit/patch out the nasty bits before they even become binaries if anything like this ever does go ahead! (Seems unlikely to really work for Linux users anyway really though, for many of the reasons you suggested!)