Literature is a bit different from topics such as physics or math. Cheating in literature means plagiarism: in the context of academic work plagiarism is defined as copying the words or ideas of others and not giving proper credit (e.g. a citation). This is because unlike math or physics, work in literature usually involves writing an essay that makes an argument; it doesn't involve the same sort of logical problems that only have one answer.
If someone copies our content word for word, it should be pretty easy to use turnitin.com or a simple Google search to figure that out. If someone uses the ideas in our content but rewords everything, it's a little bit harder, but given all of our content is online and timestamped, it's still somewhat easyish.
We can't really know which questions are homework questions unless someone tells us. So if we treat questions involving cheating differently, we're really only treating questions where the OP admits to cheating differently--given how easy it is to lie on the internet there isn't much point to that. If someone wants to cheat, it's really up to their teacher to prevent cheating, which again due to Google and turnitin should be doable for teachers who care about preventing plagiarism and are able to put in the time to enforce rules against plagiarism.