This is a problem for short fiction submissions and it's not just going to go away. The link goes into details, but this is a graph of submission bans since 2019. Plagiarism and bot-written spam.
http://neil-clarke.com/a-concerning-trend/
A Concerning Trend – Neil Clarke

@clarkesworld @clarkesworld@mastodon. Google and Bing do not demote A.I. generated content. After all, with Bing Chat and GPT3 in the new Bing search, and Google racing to incorprate their language model into their products, they are not going to demote something that they themself introduced and are using. "Google doesn't care if the content is created BY people, as long as it's created FOR people."