What about blockchain tech doesn't work? It's a relatively more tame technical problem than any GenAI.

Usability. The use case of GenAI is pretty clear at this point. With blockchain, the big question was, "Okay, we have this cool tech, but what do we do with it now?" If you have to think about what problem a tool solves, it's not a good tool at all.

To some extent, usability.

But since the target audience was always technical (although gullible) people, the incentive to make it useful beyond coin purchases never manifested.

But moreso: scalability.

The blockchains that are worth anything don’t scale to the level of total worldwide transactions per second.

I’ve heard “But Lightning!” — sure, so before I can send any money, I have to find a fellow to relay my transactions against.