Why nobody is doing Cross-Region failover:

For Cross-Region Replication (CRR) and Same-Region Replication (SRR), you pay the S3 charges for storage in the selected destination S3 storage classes, for the primary copy, for replication PUT requests, and for applicable infrequent access storage retrieval charges. For CRR, you also pay for inter-region Data Transfer OUT from S3 to each destination region.
aws.amazon.com/s3/pricing/

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