“Landlording” is a word. It’s the act of performing the work of a landlord.
Anyone can pay someone else to do work. But the act of hiring others and making sure they’re doing their job is still work.
The majority of landlords are known as “mom and pop” which means they only have a few rentals. Many small landlords don’t hire a large team because there’s not enough money coming in from the rental to do so.