I doubt facial recognition is a switch turned "on", rather its vision capabilities are advanced enough that it can recognize famous faces. Why would they build in a separate facial recognition algorithm? Seems to go against the whole ethos of a single large multi-modal model that many of these companies are trying to build.
Not necessarily famous, but faces existing in training data or false positives making generalizations about faces based on similar characteristics to faces in training data. This becomes problematic for a number of reasons, e.g., this face looks dangerous or stupid or beautiful, etc.
