Of course the hotel can track your face with lobby cameras, your room key when you authenticate with the elevator and door, and monitor your use of the Wi-Fi, so really they don't need a camera or hall effect sensor to know you are coming and going or get some idea of your preferences.
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.
i dont think the point is tracking your patterns [that is an issue of itself tho] i think the more proximate issue is that a criminal may photograph record or live stream our intimate moments that occur when there is a full expectation of privacy.
