I don't think the techniques and technology have become quite refined enough for this to be widely deployed, at most people are simply experimenting with the id

I don't think the techniques and technology have become quite refined enough for this to be widely deployed, at most people are simply experimenting with the idea. But people are taking this seriously because it represents quite an attack vector once things fall into place. The thing is we won't know when we've reached that threshold until the first news stories about a widespread phishing scam using the technique emerge. It seems VoIP will be the first low-hanging fruit: https://arxiv.org/pdf/1609.09359.pdf https://arxiv.org/pdf/1609.09359.pdf