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OpenAI strikes Reddit deal to train its AI on your posts
(www.theverge.com)
This is a most excellent place for technology news and articles.
Yes, that is what we're talking about. There were a large amount of users that updated their comments to something basic and then deleted those comments. I'm fairly confident that before they happened they had zero need to implement a spam prevention system like you're suggesting. The fact that all those users' (including myself) comments are still is evidence of that.
They may have implemented someone like that recently, but not before.