Commerce and Bike already deploy similar bots which patrol the casinos.

I'm not sure exactly what they do. They are not equipped with any weapon.

My guess is that they scan people for weaponry and quietly alert human security. They also probably have all the faces of people banned, and report anyone violating those bans as well.

Commerce also uses a service bot for delivering food, but seemingly only in the high limit room, as I believe the other room is too cramped for the bot to move around, and it's also sunken and would require the bot to traverse a fairly narrow ramp.