Of course they are, landlords are buying the house for what you would and doubling the mortgage payment as your rent. It should be illegal for people/corporations to rent out more than one single family home.
Residential units are generally considered 4 units or less. Over 80% of landlords are just normal people who spend their hard earned money on properties like this. Mom and pop landowners are incentivized to rent out their units as quickly as possible. Corporations, on the other hand? They can buy up entire neighborhoods and rent a single unit out for years just to manipulate market prices in their favor.