There's a lot of demand for decentralization in AI, and a lot of proposals reach instinctively for "blockchain".

Blockchain solves one of the least interesting problems in this domain, and leaves the rest unsolved.

For example, there are a number of schemes to allow people to pool their data and get compensated when models use it.

But few of those proposals do anything about being able to revoke access to their data.

Data is naturally viral; once it is given to arbitrary computation you don't control, access to it can never be revoked.

That is the critical problem to resolve.