The problem I see is that your dealing with countries and the stock markets and the millionaires + and corporations. And if at anytime they consider any form of block trade a threat to their profit or a security threat to their country like in the form of laundering. They will shut it off or ban it.
Also on a side note they can create this condition themselves and then enforce a ban because of it. The ole create problem provide solution we have seen for so long in the govs of countries.
All I can see is when one county does ban it, it all takes a big dip no idea if 2 or 3 did.
Not backed by gold or oil or gas or some form of commodities, or something solid its going to be a high low spiking system for sure.