Almost certainly RMT gil-farming bots. Unfortunately, it's significantly harder to prove that's the case, so SE is very slow to do anything about it. You should report them, but since neither multi-boxing nor having stupid character names are, in and of themselves, against the rules, SE will then have to watch those bots for quite a while and see where their gil goes. Eventually (hopefully) they'll gather enough data against the RMT to be able to ban their accounts, but don't expect it to happen any time soon.