I watched that highlight. It was a 'bot' with max cash all the high tier rs3 items botting on goblins...
also who bots with 20m left on accounts on osrs? Surely actual players mule it off so the amount is banned with the account. Tbh I think they did all this so they have hard cash to put into the well for charity, all the bots regardless of what they are doing have loads of cash.
Also I think there are a few actual ones put in the mix too