Many people do. I certainly never wanted anything to do with that rental market when I had a vacant condo.

The unintended consequence is that there are closed rental networks that never advertise and only rent to vetted people with reputation on the line. These often have cheaper rents than publicly advertised rental properties because the risk of bad tenants has been reduced.

It turns the public rental market into an adverse selection phenomenon. Over time, the best tenants have access to cheaper better rentals that are never even visible to the average rental tenant.