Every time I speak to an Indian on the phone they’re speaking English, but not really an English conducive to my understanding them. The Filipinos are a little bit better, but I can see where Amazon would want North Americans.
Yes, Indian English is...different.
When I was involved in a call center in India, we offered college grads with beautiful, unacented English. Many potential customers said the rates were too high, the other places were much cheaper.
Say what you will, Amazon customer service is tops in my book, Indian accent or not.