There are two ways how a scheduled pod can get its PVCs unbound:
- admin forcefuly unbinds it
- user deletes original PVC that was bound when the pod was scheduled and
  creates a new one with the same name that does not get bound from some
  reason.

In both cases we don't know where the original PVC pointed at and if we
should account it to the limit of attached AWS EBS / GCE PDs etc.

The common pattern here is to count it in when in doubt.