The landlord doesn't provide the place to live, it is already there, and the cost of upkeep is lower than the rent otherwise the landlord wouldn't be able to make a profit.

This is different from, for example, a retailer, who provides the service of gathering things into one convenient place, and does so more efficiently than everyone gathering the things for themselves. A retailer's profits are payment for providing that social utility.

Landlords' profits are mostly a consequence of their holding rights, rather than the provision of any comparable social utility (there are some small efficiencies to be had, but they are not the primary driver of profits).