[cf]

Sure, but is it actually deleted? Or is this still stored somewhere in Google ready to be retrieved if needed?

[aiiane]

It's actually deleted, though it can take some time for deletions to propagate through various Google systems and backups - we can't violate the speed of light and​ we wouldn't want a bug in the deletion code to result in a catastrophic loss of things users wanted us to keep.

[pawadu]

But what if my data has already been used somehow. For example to train next generation speech recognition AI.

What will happen to that information?