There is a feature of showing suggested tags after the body of a question is included. These suggestions are based on the body of the question. More details can be found in these posts: Automatically determine tags while writing a question How are “Suggested Tags” chosen? I will quote part o...

So this is pretty straightforward I think: What do we do if a user creates multiple identical questions? What if a user make another account and asks an identical question? What if another user asks the same identical question - even if the intention is to get an unanswered question answered? ...