Sounds like Gridcoin. The problem with these systems is that it's difficult to write a useful proof-of-work scheme that produces useful work as side effect. So you have a loss of decentralization vs conventional cryptocurrency, but at least you have "fairer" distribution compared to proof-of-stake alone.
The "Offer" Model presented just seems like a conventional multisig escrow, presumably with the blockchain serving a as a signalling mechanism?
There is no proof-of-work or proof-of-stake involved. There is no consensus required. This is a marketplace. The blockchain is used to handle and log transactions.
the offer model will require a multisig escrow, but with some additions. We need to be sure that when someone buys compute, the same computational resource is still available. To solve that, you can use a fair exchange protocol.
This is a great idea; this is what Holochain and the Holo project are doing for all of your compute, bandwidth and storage, and could quite easily be extended to specific types of compute such as GPU as well.
"GPU Restaking enables providers to offer computational resources on multiple platforms simultaneously. This approach allows sellers to earn from existing commitments while generating additional revenue streams. Similarly to crypto-economic restaking, providers lock-in their computational resources on one platform, then “restake” them on another."
They seriously believe they have an innovation here and their error is in confusing ethereum's 'stake' [which just sits like a rock doing nothing (and can therefore be multiple rocks to multiple ethereum derived chains doing nothing)] to real world actually utilized 'stakes' like GPUs.
This type of magical non-thinking, while common in crypto, affects ethereum-types a little more.
The "Offer" Model presented just seems like a conventional multisig escrow, presumably with the blockchain serving a as a signalling mechanism?