I'm confused as to why AI spammers haven't at least started trying to hide their AI posts a little to make them sound more human. example; replacing "you" to "u" and not having proper grammar. This probably wouldn't entirely fool an AI detection test but at least they would look a little more realistically written by a human than AI.
If they are too lazy to just think about what they are going to type, then how do you expect them to go through all that trouble of replacing words. Now you have talked about it, how many users do you often see should short forms of words such as "u" or "bt"?
Seeing a user try to spin the text abbreviate normal words, which is unusual behavior here in the forum, is a number one red flag for me.