I'm not 100% sure, but I would say that if there is a bot which is a big if at this stage. I think it works more like a market maker. By always there to offer a price to buy or sell. They profit from the spread between the two. With such a big trading arsenal in the form of investors deposits, its not beyond the realms of possibility as to how they generate their income. Also don't forget the income it receives from the trading of its coin within the platform's internal market. These fees are not insignificant considering how many investors are on the platform.