Where egress hides
Inter-region replication, cross-AZ traffic, NAT Gateway processing, CloudFront-to-origin, and customer-facing API responses are all egress vectors that don't show up on the resource-by-resource cost view. They appear as a 'Data Transfer' line that doesn't name the source resource.
Why it scales with traffic
An idle instance has near-zero egress; a popular customer's traffic can dominate egress for an entire account. This means egress cost can grow without any infrastructure change — making it the line most likely to surprise.
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Frequently asked
Why is AWS egress so expensive?
AWS egress to the public internet is generally $0.05–$0.09 per GB, which compounds quickly for high-traffic workloads. Cloudflare R2 and DO Spaces are cheaper alternatives for egress-heavy use cases.
Does DigitalOcean charge egress?
DigitalOcean includes a per-Droplet bandwidth allowance and charges $0.01/GB above it — generally cheaper than AWS for egress-heavy workloads.