I don't understand why my opinion gets ignored but if you don't believe me, just check and analyze the situation yourself. So, I'll tell you why actually repetitive questions are asked on this forum:
There are a lot of people who post just for the sake of signature campaign earnings. There are threads in every boards that require some knowledge and mental work to answer. For someone, who doesn't speak English and didn't have access on proper education and comes from a very poor country, it is getting difficult to post in these threads and it will take a lot of time, so here is what they do: One newbie registers on Bitcointalk and creates threads that have been answered thousand times but doesn't show up on first page of board and at the same time it's easy to answer, for example threads like this: Is money the root of all evil?, Bitcoin vs Stock market, Will bitcoin replace banks?, Will bitcoin end world poverty?.
These threads are easy to abuse, you just always side with Bitcoin, even with nonsense text and no one complains. So, the scheme is following: One user creates thread that is easy to spam and hundreds of users post in this thread. Then this one user creates another thread again and again. This one user is not alone, there are other users who follow his path and finally tons of spammy threads are created that feeds spammy users.

Just check it yourself, this is something that needs to be fixed. I am not against what you do but to be honest, an AI can do nothing in this case. One positive thing it can bring is to report some nonsense posts or threads to moderators.