This fundamentally does not work, because being able to copy is such an essential feature of electronic information. Think about it - you can never really "lose access" to information in the computer world unless you purposefully delete it completely, which cannot be realistically ensured.

I understand what's you're saying, that any digital scarcity is by design and therefore artificial.

But damn I wish my Steam library had a resale value.

As more games become unavailable for purchase (e.g., the recent nonsense Epic pulled with old Unreal games), it will.