My guess is that they're currently nowhere near robust or effective enough to make that realistic. They need to bootstrap somehow, if only get good enough to convince hotel management that their approach will be realistic in the future.
in that case they could operate the robots remotely just like self driving cars sometimes
This is my take too. Hotels wouldn't be happy if a robot knocked a water jar on the carpet, or scratched a wall, but a home owner? We're doing it for free and you asked for it!
Hotel's girl management might be more undertanding than I assume, though.