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Epstein Files: X Users Are Asking Grok to 'Unblur' Photos of Children
(www.bellingcat.com)
This is a most excellent place for technology news and articles.
Easy answer is , they don't
Though that's just the one admitting to it.
A lightly more nuanced answer is , it probably depends, there's likely to be some inference made between age ranges but my guess is that it'd be sub-par given that it sometimes struggles with reproducing images it has a tonne of actual data for.