AI definitely follows some logic, algorithm but at the same time it takes data from internet and some texts, written by humans, might be exactly copied as it was written, but at the same time we have Grammarly with it's Premium plan that features check for plagiarism, makes sentences to look like it's written by someone fluent in English, has ability to change sentences and still keep the main idea.
I think it's a waste of time to focus on whether every random posts are written by AI or not, I don't even think it's bad idea to post an AI generated answer if it truly solves the problem of the user who asked a question.
But I think we can detect users who use AI frequently or abuse it. One scheme, that I often see on this forum is this:
User A creates a thread with titles like: Can bitcoin end poverty?, Bitcoin Vs Gold, Bitcoin Vs Fiat, How to trade safely, Is money root of all evil? Why did you have faith in Bitcoin?
After that, a lot of spammy users come and post tons of shit posts because these subjects are easy to abuse. So, the scheme is: One creates spammy thread, hundreds of spammy users come and spam. It's like, one user feeds other users to earn money.
This user called
Susano is a perfect example of what I talk about right now.
So, I think, our priority should be to eliminate these type of users who feed spammers. Because of these users, we also catch spammers in their threads. Usually, these users and their spammy posters are the ones who use an AI.
And to my mind, if you look at user's post history, it's easy to understand whether they use an AI or not. When they use an AI, their posts and answers are general, you can feel that the answer is only answered according to thread title and it had no clue about the OPs post.