The Internet is fucked now, the only valuable untainted training data is the Internet as it existed prior to this AI bullshit coming online. Confirmed human content is going to be super valuable, so expect our privacy to be fucked as well..
It's not going to. It's just going to get more widespread and harder to detect. The incentives favor developing better and better AI. Luckily one of the solutions to this issue is - wait for it - AI. With a good enough AI, especially a generally intelligent one you don't need search engines anymore. You just ask and it gives you the answer. If you think AI couldn't do this reliably then that is not the AI I'm talking about.