Well, I have academic interests, but English is not one of them because my English is far from that level I can safely call academic. I am primarily here to learn by teaching. I think interactive ("students" answer back ) teaching is the best way of learning. I do not think I would fit any of your categories. Therefore, I remain svartnik.
You're so learned, Svartnik, that I would include you amongst the Academics. It is clear from your native language that your contributions are technical and theoretical, as well as academic, rather than contributing a regional "ear" for phrases as many of us native English speakers do in addition to contributing technical observations. Still, your encyclopedic knowledge of linguistic principles, as they apply to English, make you a good academic too.