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It's quite an oversight for the writer to not mention even once Ethereum's switch to Proof of Stake, which will shut off all mining in about two months' time.

Any way, it would be nice if, after the switch to PoS, these GPUs could somehow be repurposed to processing nodes for an open and decentralized machine learning application, to rival centralized and closed efforts like OpenAI.

BOINC is not decentralized. I should also add, that I envision this application providing compensation to GPU nodes, rather than being volunteer driven. That's the only way to compete with centralized/closed AI systems across all markets.
Won't just mining switch to another GPU proof of work currency?
Yes and no. The main aspect is that ethereum mining is much bigger than all alternative GPU-mineable coins. When I checked it using whattomine back in January, ethereum mining was roughly 16 times bigger than all others combined.

Since the number of coins mined is fixed regardless of the effort expended, the revenue per card would tank if every ethereum miner switched to other coins.

Can't wait for these to start dropping on the used market and driving down prices.

They can't all be those cmp-series e-waste cards, can't they? Or are cmp cards usable for Cuda or other gpu acceleration?