You just reminded me there was some penny stock that was entirely just a smart mirror play, I believe two years ago, that ran damn near 10,000% just off of its smart mirrors launching for sale in stores.
I've never used them myself but smart mirrors have picked up a decent amount of popularity.
I even see smart mirrors used at parties here and there, as a photobooth setup, so having them in the EV Hotel rooms seems well placed to me.