Again, this is a techie take. Lots of people for example use ChatGPT for personal therapy and guess which subs their training data comes from, r/relationships etc. Those trying to use them for other means are comparatively less frequent.
When I say casual, I mean youtube style comments where people just post memes rather than engaging, thoughtful content for whatever niche they're in. Which is essentially noise for training data.
Your interpretation of casual as stuff like r/relationships is itself "techie talk".
