Some brokers are hiking the GBP pairs margins due to the 'flash crash'. (https://smnweekly.com/2016/10/07/ig-group-hikes-gbp-forex-pairs-margins/ ) and I suppose others will follow suit as well. What's the point of doing so now though, considering that the crisis already happened and it's very unlikely for the same thing to happen all over again in the foreseeable future?
Brokers with negative balance protection are probably a bit scared of the potensial cost of such flash crashes. And because the liquidity is much thinner and GBP is much more voletile now, it does make sense for them to be more careful.
Same here, I still prefer real market conditions, a processed order is done and final. There is no room left for later manipulation, process reversal (orders just closed / cancelled with no loss or profit, for no reason), etc. If a broker can make black swans, white swans and grey swans into non-events after the fact.... it would raise a few questions for me.
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