"Accountable" is just a fancy word for "pinky promise, but with a label." Nothing stops the data from ending up in a training run once it's already been fetched.
...and the only way to stop[1] that is by effectively DRM'ing everything, which is a level of dystopia that I don't think even Stallman ever anticipated, nor do I want to happen.
[1] Analog hole and other workarounds aside, naturally.
