I've seen several cases of this happening on twitter/forums. Save hacking was made possible a while ago, meaning people can just instantly get pures on all gear and jump their rank to X right away. It's sleazy, but at the very least it means that weapon hacking isn't a thing.... yet.
Openly showcasing that you can hack by picking an character that's unavailable to everyone else is a pretty dumb move, though. There is actual mod support in this game meaning you can get banned pretty quickly. Or perhaps even better, they can just release a patch that instantly bans anyone playing as octoling, that'd be kind of easier.