I doubt these companies constantly downloading the full training set rather than keeping it in a database somewhere.

Hard to argue keeping a copy of some copyrighted work indefinitely counts as transient.

> I doubt these companies constantly downloading the full training set rather than keeping it in a database somewhere.

Precisely to argue for transient copies, they don't need to keep terabytes of data stored.

>Hard to argue keeping a copy of some copyrighted work indefinitely counts as transient.

You're assuming that they're keeping the works indefinitely, which again is not the case.

> Precisely to argue for transient copies, they don't need to keep terabytes of data stored.

Those kinds of legal workarounds rarely work.

They are dependent persistent access allowing them the equivalent benefit of keeping a persistent copy.