Possible explanations
1) Their engineers never thought of it
2) They considered it, and it is as simple as you think... but they don't care about uptime.
3) Implementing geographic redundancy is harder than you think given whatever other constraints or environment they face.
4) Some other explanation
#3 seems like the most likely explanation to me.
Possible explanations
1) Their engineers never thought of it
2) They considered it, and it is as simple as you think... but they don't care about uptime.
3) Implementing geographic redundancy is harder than you think given whatever other constraints or environment they face.
4) Some other explanation
#3 seems like the most likely explanation to me.