Because it's essentially a lie. As revealed by your formulation "just say" -- your experience is no different if everything in your possession is 'owned' by you and illegal to modify, or if they change their mind and "just say" everything in your possession that matters with regard to this isn't really 'owned' by you at all. It's not a step forward, it leaves you in exactly the same position. If it is insane, then "just saying" something doesn't make it more sane.
My concern is the experience of not having control over our equipment (not a good experience or way to live), not a semantic technicality.