Not only AWS, but GCP also charges for network communication across availability zones. Moreover, your understanding is correct.The key here is the use of S3 as a shared storage feature. Reading and writing S3-like object storage across AZs will not incur cross-AZ traffic fees. Cloud vendors charge for API call fees and storage fees for object storage.
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Not only AWS, but GCP also charges for network communication across availability zones. Moreover, your understanding is correct.The key here is the use of S3 as a shared storage feature. Reading and writing S3-like object storage across AZs will not incur cross-AZ traffic fees. Cloud vendors charge for API call fees and storage fees for object storage.