Couldn't agree more with your comment. We are working on counter measures like manual verification of voice, a classifier to detect cloned speech, etc. As of now we have auto moderation in place that detects and blocks hate/harmful speech.
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I think that a few years from now this tech is going to be ubiquitous, real time, and work on a mobile device. Trying to slam the lid shut on Pandora's Box probably isn't going to work.. the best thing at this point would be for the word to get out to everyone that voices can now be doctored the same way photos can