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Re:Zoom taps Oracle for cloud deal, passing over Amazon, Mic... by jakupovic on Tuesday April 28, 2020 @07:15PM (#23013306)
aws was used for storage and encoding initially. source: worked at aws
Re:Zoom taps Oracle for cloud deal, passing over Amazon, Mic... by redis_mlc on Tuesday April 28, 2020 @11:53PM (#23015154)
Encoding servers, but not streaming servers.

The well-known US CDNs were used for streaming.

Also, the cloud they picked doesn't matter because:

1) They used their own ASG UI, Asgard, since AWS initially didn't have one.

2) With around 1,000 engineers, they could migrate clouds at any time at a future date (or build their own CDN. There was no silo politics as in most other companies.)