Las Vegas casinos do the same. Look around you the next time you enter a casino or a bank. There are cameras evident and these are for publicity purposes. That is, they are there to intimidate a potential robber or petty thief from doing anything, knowing that their actions are being recorded. The owners of these establishments want you to see these cameras and they want you to think twice about doing anything naughty in their places of business.
Then there are the hidden cameras. Almost always wireless so they can be placed anywhere, they photograph through small holes in the walls or ceilings, or from behind specially designed ordinary devices youd expect to find in the location. Wireless security cameras are the ones that provide information to the police about who may have committed some crime after they disabled the visible systems.