BUT ! Sovereign Wealth Funds are restricted (Volcker Rule) from such short term hedging/trading, other than for a relatively small proportion (something like less than 3% I believe). Otherwise there'd be too much manipulation in the likes of what you outlined - that would stall the market(s). The likes of GAPP is voluntary, but if any one member started abusing the market(s) the others would likely curtail access/banking to the culprits detriment.
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