https://www.descript.com/ and Lyrebird prevent people from making copies of voices that arent their own, but it looks like that cat is out of the bag.
Abuse potential notwithstanding, and ignoring the complete distortion of "reality" coming soon, I'm extremely excited for this technology to become more mainstream. Being able to edit audio and video, like you edit a word document. Record a conversation for a couple hours, compile the transcript, and synthesize it into something tight, all without the need for a traditional video editor. Voice synthesis for words that werent spoken, or misspoken, frame interpolation and morphing to prevent the jaggy youtube cutting effect.