I've also noticed that when I communicate with Grok in my native language, its tone is more natural than other models. I think this is due to the advantage of being trained on a large amount of Twitter data. However, as Twitter contains more and more AI-generated content now, I'm afraid continued training will make it less natural.
Did you try meta? I was into grok but now meta works well for me
I'm sure Twitter knows which are the bot accounts and is surely excluding them from their model training. Twitter bots aren't a new phenomenon after all.
Sadly, it's more likely that people will just start talking like bots
The causation could also be the other way round.
Twitter language has started seeming normal casual to us, rather than us using normal casual language in Twitter.