When a landlord takes money from tenant’s deposits every time they let it out, but never use the money to actually fix or replace the thing it’s for. Often the damage being charged for is more like fair wear and tear, or was a problem before the tenants even moved in.
My landlord took our deposit to replace the carpet that was stained when we arrived. I know the next tenants and when I went to visit them, the stain was still there. Seems like they were just deposit farming.