I've lately seen threads on the service board advertising AI-generated articles and posts. But everyone will know that these posts are written by a robot because it won't fit properly in a conversation (unlike the master AI above me).
Yeah at these times we can detect the sentences written by AI because at some point you will feel it's not mixing up to make a valid point like google translator but with advancement in technology and better programming AI is capable of writing really good posts which can't be easily caught by us.So do many users 
They are setting up base content for bots to write articles but the thing is AI will improve with time while those members keep repeating the same points after years also just to write posts.