I suppose that exchange risk is always going to be a (potential) problem. If the custodian is moving funds on and off the exchange, I see a possible problem with transparency. The protocol’s broadcast of liquidity information works because it pulls in information from real exchanges* so if funds were moved off of the exchange, where would they go? For crypto (like NBT), it could go back into either the grant address, or another one that is identified by the custodian, but for fiat … like the profits that are recycled in @KTm’s proposal … I worry that an even larger logistical problem may be introduced.
Are traders going to be expecting that there will be available, visible liquidity in on the exchanges? Does the preception of the size of the walls make a difference for how “secure” nubits appear to be as a currency?
* Though I suppose it may be suscepitble to being spoofed, but I am not sure. I was not involved in that part of the development so I do not want to speak out of turn or introduce a confidence problem.