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"DynamoDB uses synchronous replication across multiple data centers for high durability and availability"

This does not seem scalable for OLTP type load on some busy store. Again I think you'll be way better of money wise hosting your own database on real hardware either on prem or colocated

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DynamoDB is used by Amazon.com.

"Across the 48 hours of Prime Day, these sources made 7.11 trillion calls to the DynamoDB API, peaking at 45.4 million requests per second." [1]

[1] https://aws.amazon.com/blogs/aws/amazon-prime-day-2019-power...

You're forgetting specifics here and the amount of hardware resources thrown into it. I've already told that I am not discussing here FB/Google/Amazon scale stuff. It is their problem and not shared by more regular deployments

TIL: A day has 48 hours at Amazon.

The same day across multiple time zones could take 48 hours

Of course Amazon would call that an Elastic Sundial.

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