I would be genuinely surprised if hotels implemented facial recognition. I'm the one who doesn't touch hotel WiFi - cell tethering to the rescue. And yes, all these hotels use NFC keycards, which makes the placement of door sensors even more puzzling. You can't be invisible in a hotel but there is a level of knowledge on your whereabouts that they just don't need. Sadly the Las Vegas incident isn't helping as management is more paranoid than ever of a repeat.