As stated in the latest blog update on the GDAX website by Adam White - VP @ GDAX:
ETH-USD Trading Update #2
"This is the second update regarding the ETH-USD trading activity on June 21st, 2017. You can read the first update here.
GDAX is just over two years old and has grown to become one of the world’s leading digital asset exchanges. We launched our first version of margin trading earlier this year and have generally seen strong customer demand and positive feedback.
Our long-term ambition, however, is to be a leader among all exchange platforms and we are committed to serving as the most trusted provider to the world’s largest institutions and professional traders. We are confident that all trades this week were executed properly, however, some customers did not receive the quality of service we strive to provide and we want to do better.
We will establish a process to credit customer accounts which experienced a margin call or stop loss order executed on the GDAX ETH-USD order book as a direct result of the rapid price movement at 12.30pm PT on June 21, 2017. This process will allow affected customers to restore the value of their ETH-USD account to the equivalent value of their ETH-USD account at the moment prior to the rapid price movement.
To clarify:
For customers who had buy orders filled — we are honoring all executed orders and no trades will be reversed.
For affected customers who had margin calls or stop loss orders executed — we are crediting you using company funds.
We view this as an opportunity to demonstrate our long-term commitment to our customers and belief in the future of this industry. We will follow up directly with affected customers about this process next week.!"
This is extremely interesting and I expect ETH prices to be positively affected by the news, the fact that they honored the executed buy orders and didn't reverse then, and are willing to re-credit losses from company funds is applausable.