The fact that the landlord is also getting an extra 1000 a month means they’ll be less incentivised to put up the price. Also market forces, it’d just take a couple of landlords to have some morals, or prioritise having their properties filled to keep prices down.

With the restaurant example market forces again. If the shitty big chain restaurant put up their prices and the nice local restaurant didn’t then suddenly they’ll see more people going to them. It would also make it really easy for shitty chain B to undercut shitty chain A.