Those sound like bots with an automated script that just fires off pre-recorded input to do something that generates value ad infinitum. I suspect the ones by the aetheryte are doing duties via Duty Finder that can yield tomestones, buying sellable items with the tomestones, selling them for gil, and then selling the gil for real money via the web sites that spam that this thread was actually created about. At any rate, there's a page for reporting the bots, too:

https://support.na.square-enix.com/f...=5382&la=1&p=0