I agree with your opinion. I've been writing in Splinterlands, and in my opinion, since Splinterlands is very niche game topic, its currently less prone to farmer creating AI generated content. But we won't know for sure in the future.
I could just think some aspect of an original writing: 1) It contains a personalized opinion of the writer; and 2) The writing would use some referral, either a referral link pointing to other paragraph within the posts or link to the writer past content.