I am not at all comfortable with this. Even though it is an amazing demo I feel the release of this tool could not have been more ill-timed. It has all the potential of wrecking US elections this year. I don't really know what the optimal release time should have been but I don't see how this can be used for good at all. And I am still just considering implications of this restricted to elections. I am not even going to think about what it would mean to child porn, terrorism and even entire assassinations orchestrated to destabilize a Government leading to Civil/World Wars. Lots of things can go wrong with this tech.
Another huge issue is fraud. People impersonating others for financial fraud, etc.
Question is, is it stoppable? Doubt anyone thinks it can be stopped unless you get into fascistic/communistic/authoritarian tactics of arresting people for just using it at all.