Make no mistake: this is nothing more than the old "treacherous computing" that RMS warned about a long time ago, but coming back in new clothes, and is going to be used the most by DRM and other user-hostile applications. They're just trying to sneak it past everyone under the guise of "security" and other ostensibly-somewhat-friendly uses, but don't be fooled.
https://www.gnu.org/philosophy/can-you-trust.en.html
https://en.wikipedia.org/wiki/Next-Generation_Secure_Computi...