It is natural that like all traders, a forex dealer will also be tempted to profit from shortage by building up a hoard. Therefore, to align incentives of the forex dealers with the larger public purpose, we are constrained to impose restrictions on positions, knowing well that such restrictions may impair liquidity in the market. Let me mention another aspect in passing.
It also applies to money laundering and counter-terrorism financing. There must be similar treatment across the board. All the regulators will have to reach an agreement... Yes, this is a global problem and it must be handled at a global level.