Cards don't "expire". There are alternate strategies to selling cards, but if they don't sell the cards, then there is no transfer of ownership, and therefore NVIDIA is entering some form of leasing model.

If NVIDIA is leasing, then you can't get use those cards as collateral. You can't also write off depreciation. Part of what we're discussing is that terms of credit are being extended too generously, with depreciation in the mix.

The could require some form of contractual arrangement, perhaps volume discounts for cards, if they agree to destroy them at a fixed time. That's very weird though, and I've never heard of such a thing for datacenter gear.

They may protect themselves on the driver side, but someone could still write OSS.