Never have we had a more clear example of why Google needs to be regulated, and laws against what they're doing needs to be passed. The fact that they think it's okay to have bots pretending to be human making phone calls, shortly after demonstrating how quickly they can copy someone's voice (re: John Legend), it shows a blatant disregard for what they're creating.
How would you handle deepfakes? This is much more disturbing than what is in the post, and it isn't a corporation who built it. I don't think this has anything to do with regulating google.
If a real problem of deep-fakes in phone conversations emerges, people will just raise the bar of authentication in phone communications. There's nothing magical about telephone that makes it exempt from the general need to protect against social engineering.