The Daily Mail (vomit) alone publishes 1,500 articles a day. How many do you plan on publishing?
I have an automatically generated infinite maze. It produces roughly a million unique pages each day. It used to produce ~60 million pages / day, but a few months ago I decided to firewall some of the crawlers off instead of serving them garbage.
And I run niche sites. A site with more lucrative traffic than mine (eg, Codeberg, who uses the same software I do) likely generates a lot more garbage.
There was also a paper, commissioned by Anthropic, I believe, that concluded that only 250 malicious pages they fail to remove from the training set is enough to poison even the largest model. Now, I do not trust anything Anthropic says. But even if we'd need a billion pages to poison a model... I alone served that much in the past year.