Projects are often and will continue to be judged by their marketing. There are many such cases of "I'm X years old and I made Y" posts on Hacker News reaching the front page. As a founder, you should use whatever you can to get eyeballs on your product. As a hacker, you should try to make something you think is cool.
While it is obviously cool to have something novel or technologically interesting to showcase, the value is often less in the actual product and more in the nostalgia and reminder that we too, as boring adults, were once younger hackers.
Let's not be so hard on each other. I think it's a pretty well designed landing page (although the mobile website needs some work in terms of responsiveness.) I don't think this is similar to Anki because there's no spaced repetition or flashcard retrieval involved (from what I could tell).
It does seem like a tool for cheating which is somewhat questionable. I do like the idea of a young hacker today figuring out how to automate their homework, but I think the tool can be a bit more tailored and more ethical if it focused on a specific use case students would equally pay for (ex: AP test prep)