How do we get a rank?

Hi everyone! You know many players has a rank such as Legend, Immortal, and Eternus. But I am curious that are all of the players paying for it, or is there some way you can get a rank without paying? I knce heard from my friend in Miniblox that you can get if you have a sub acount, or a another acount in Miniblox, so I did it, but it turned out that you need to gift a rank to your real acount, using your sub acount, still requires payment... If any of youguys know, can you tell me a way to get without any payment..?