we are already seeing plagiarising scams, where scammers copy paywalled human written content, paste into ChatGPT for a tonal rewrite, before republishing the freshly laundered material into your own Substack, in order to grow an audience, which the scammer will no doubt drop his own paywall onto a some point. Free money to be had, hard to see how it can be policed
We've already seen Instagram Reels, YouTube Shorts, and TikTok steal content from each other all the time.
Content is a commodity that's losing value, fast. Blogs regularly post meaningless content for the sake of keeping up a regular schedule. I've seen this start years ago when junior devs got recommended to keep up blogs for their resume. The amount of blogposts I've seen documenting basic syntax of programming languages is insane. Or clickbait posts telling you "why you shouldn't use Typescript".
The trend where you need to actively push content for traffic is a bubble that's gonna burst. You're already seeing it happen with streaming services, they're culling their content because it's just becoming way too much.