CEOs can be held accounted for and sued for unlawful use of this technology. This technology becoming open source and have contributors from around the world is the closest we can get to Pandora's box. I dont like big business or intelligence agency as much as the next person but that doesn't mean this technology should go to the people, who will abuse it for the reasons you're afraid the "tyrants" will.
On top of that, if it's an audio file it'd have to be a specific format that cant be used or converted in order to let that be possible, which it's unlikely to be. The current AI uses wave formats and you cant just mark it with a hash or data to decode if it was AI generated. And even if you could, there are ways to circumvent this but extracting the audio onto a format that cant be traced back. I don't believe there is an easy solution to this situation, and I dont trust anyone with technology. It can and will be abused no matter who gets their hands on it.