Cameras in the lobby, the hallways and the elevators, sure. But in a hotel room?
That's a great way to kill your business in no time.
https://www.alternativetravelers.com/airbnb-effect/
https://www.epi.org/publication/the-economic-costs-and-benef...
I think if they do it, at least in Europe, the need clear signage that the room is under CCTV surveillance and I do think that this is a legal requirement in most European countries and even the extremely camera happy UK.
I think I'd bolt might fast if I find such signage in my room. If they put up cameras without indicating it that would be sure as hell illegal.
I think like a hotel - these cameras were at the lobby, the hallway, the elevators, and the outdoors. Nothing was viewing the personal space.