Are they only in three zones, or three regions? Three zones would not have helped them in this particular scenario and they would have still been at risk. And

Are they only in three zones, or three regions? Three zones would not have helped them in this particular scenario and they would have still been at risk. And if they do mean three regions - can that cost of spanning various regions be quantified for different companies. The money spent vs money earned for Netflix may be very different compared to Quora and Reddit. At the same time, the data synchronization needs in between regions may also vastly differ for different type of companies and infrastructures thus leading to varying amount of cost to maintain a site on multiple regions.