For me the main issue with AI creating content in internet is going to be the echo chamber of that content being used to train new AI models.
The bullshit asymmetry principle puts forth that algorithmic 'bullshit' content is even worse as quantity is a quality all in itself when you're debunking the bullshit. In general the reader will not know if the producer of the bullshit is a real human or a bot. This makes the search engines job even harder as not only do you have the standard human bullshit you have to get rid of, you have an oceans torrent of AI generated bullshit that you have to waste energy on getting rid of.
HN has a common theme of saying that "Dead internet theory is wrong", I personally just think they've not waited long enough and it's becoming more true every day.
It's less about if the businesses care and more about if the consumers care. Businesses will respond to whatever consumers are willing to tolerate.
Honestly, it'll probably be a battle around requirements to label AI-generated content so that consumers can make an informed choice about what to trust. But, given the global nature of the internet, that's probably not possible. You probably end up with private/commercial reputation rating firms, and consumers can decide who they want to trust.
If people decide they don't care about the veracity of information or don't want to put in the extra work to ensure they are consuming "true" information they you'll end up with businesses built on auto-generated garbage.