This is rather silly, you could always draw solid colors over someone's face and it works better than blurring. A rather frivolous update, from a software standpoint. The sentiment is nice.
I see the point in this, but if you're going to automate something it should be automated right! In most cases, getting specific people's faces in shot isn't a good idea in general. If you're getting five people's faces in center frame for a photo just to blur their faces out, then it's probably fair to ask why you'd even take a photo at all.
Recording and sharing are different things. If I take a picture of a cop pulling masks off of protestors, I sure as hell want to record the incident, but not necessarily share images of the victims.
>then it's probably fair to ask why you'd even take a photo at all.
There are many cases (such as the recent protests) where you might want to document something and it is infeasible to ask everyone else in the area to leave first.