"In 2024, we will incorporate a marketplace where miners can sell their unrewarded proof of work (PoW) directly to buyers over Lightning for immediately spendable bitcoins. This saves money for the miner in the form of onchain fees (so much so that they may sell at a discount) and permits third-parties to buy bitcoins in exchange for aggregating the unrewarded PoW into fewer UTXOs. The savings made by more efficiently using Bitcoin's blockchain translate into savings for the miner and profit for the liquidity provider."

- ocean.xyz

I don't know when that idea was posted, but it sounds alot like this idea :)