It is, as a matter of fact. When Fry recorded his voice for those audiobooks, they were copyrighted. Reproducing the contents of those works as they have is, arguably a violation of copyright.
And when you compare Steven Frye to Pepsi Max, that’s a false equivalence, because you’re comparing a copyrighted material to a trademarked brand which are two different things.
Still, to your point of theft, nobody is taking anything from anyone. They are using something without permission, and that still falls squarely as copyright infringement, not theft.
When they reproduced Fry’s voice with an AI based on what they captured from the copyrighted audiobook, that’s precisely what happened. Just because you refuse to understand or admit it, doesn’t mean it didn’t happen.
That's not reproduction of content so isn't a copyright violation. Not shouldn't be. Literally right now is not.
The whole reason people are so up in arms about this is that we do not currently have laws or even standards that accurately police this kind of thing.
So, like, arguing against the letter of the law, in order to defend a morally bankrupt practice in defense of profitability for large corporations, to rip off artists work.
All that it’s proof of is that you don’t understand what you’re talking about.
There are laws and standards which govern this usage, it’s called the digital millennium copyright act. While there does exist currently an argument for AI to co-op current works for what the DMCA refers to as “fair use“, whether these works would be regarded as “Derivative works” or unauthorized infringement is up for the courts to decide, not you.