Landlord of 8 years, I've never paid for my apartments to be listed on Zillow, or are you talking about buying ads/sponsoring them?

Facebook Marketplace, Zillow, Padmapper, Hotpads, Apartments .Com, and the MLS are where my apartments go. I've never had an issue finding qualified tenants from those and haven't paid a dime to list on any of them.

Craigslist's been dead for years, even pre-covid people were barely using it because of all the scams.