Bitcoin needs ASICs to run it. GPUs haven’t been viable there for a long time, and ASICs aren’t useful for anything other than the thing they’re designed to do.

Ethereum used GPUs until it went proof-of-stake, but it was always smaller than Bitcoin.

Nothing else is big enough to have caused a bubble.

Most of the AI training is being done in brand new datacenters on brand new GPUs. Those Ethereum GPUs mostly got dumped on eBay.