A charge per ASN is, from my point of view, not a very effective garbage collection mechanism.
Fully agree with Elvis here. The fee would have to be quite substantial for this goal to be met. The majority of resource holders won’t even think twice if the fee is a few hundred Euros.
Garbage collection should be enforced by clear requirements and audit of those. Discussing if this is value for money should be a consideration as well. Clean is not necessarily the same as most efficient ...