Whether you classify that as "AI-related" or not, I don't know.
Basically laundering outright wrong information into something the next generation is now going to believe as scientific truths.
I often wonder how many people/organizations are seeding places like Reddit with malinformation/beliefs for it to become canical truth in the AI age once it's too late to tell the difference for most people?
Lord knows I've made trolling-level posts that are only marginally accurate back in the day that are now part of the AI corpus of knowledge. Mix those in with some of my well-researched stuff and you couldn't even really filter it based on "this account is a shitposter" to weight it lower. Nevermind plenty of earnest posts made that were outright wrong simply due to... being wrong in the moment and later learning better.
Metadata is what makes gold out of poo, I assume model developers can "train negatively" too if metadata suggests they should.
Internet Archive has been terrible as capturing full pages on Reddit for a while. So it's not a real loss. Unfortunately right now these AI companies have full freedom to do whatever they want. Taking paid content, artistic works, and your own posts on social media. So Reddit trying to charge them is a good idea as it's some form of quid pro quo put on AI scraping companies.
Except that what Reddit is really doing is selling content they didn't produce and don't own. I don't think they're walking some kind of high road here like they would be if they were actually fighting against the scraping.
That being said I can still take some satisfaction in seeing AI scapers get jammed up considering how they face zero consequences right now.