Do you mind if I MITM all of your work output, your emails, your code, your messages, and attach my name to it and then receive your paychecks in exchange for my work?
You’re describing patents?
But if they can pay some people to produce the knowledge they can also pay them to not share it after they change employers. Just like regular noncompete clauses I don't see why this is something that require more than regular contract law or why it should be inherent instead of negotiated for a fee.
You just described the whole AI industry