CNAME removal can be forgotten when a service is deleted from Render.
Render should:
  • Alert us if we are still pointing a CNAME without a corresponding service
  • Add a reminder to delete the CNAME when deleting a service
  • NOT allow re-use of service name between tenants even when that service has been deleted
  • Add a tenant ID subdomain to the onrender.com links (eliminates the problem)