The idea of evolution is that the parts kept are the ones that are helpful or relevant, or proliferate the abilities of the subject over generations and weed out the bits that don’t. Since Generative AI can’t weed out anything (it has no ability to logic or reason, and it does not think, and only “grows” when humans feed it data), it can’t be evolving as you describe it. Evolution assumes that the thing that is evolving will be a better version than what it evolved from.
I’m not. They don’t want anyone scrubbing their data but them, but honestly I think it’s more because it’s a gateway to allow their people to get information from several sources that they don’t want their people to have.