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July 2026: EU Data Act switching charges hit zero by 12 Jan 2027; AWS free DTO-on-exit still requires Support approval and typically a 90-day move window. Exit cost is re-platform time (~$113k in our model), not the ~$4,400 egress line.
Global Accelerator charges about $0.025 per provisioned accelerator per hour—even while disabled—and adds Data Transfer-Premium on top of normal data transfer. Two static Anycast IPv4 addresses (or four addresses in dual-stack: two IPv4 and two IPv6) front ALBs, NLBs, EC2, or EIPs across Regions; that pricing model changes whether you beat CloudFront or Route 53 latency records alone.
Data transfer is the most consistently underestimated cost in AWS architectures. It does not appear in compute estimates, it does not scale linearly, and it punishes microservices designs at exactly the moment growth feels like success.
Migration TCO tools nail steady-state and miss the gap: dual-run weeks, DMS, DC egress, day-1 Config/GuardDuty. July 2026 — dual-run worksheet + MAP tagging note.
A mid-size retailer spiked to $87k in November from three data-transfer traps. July 2026 refresh — CloudFront hit-rate math, Origin Shield pricing, cross-AZ ECS, and Transfer Acceleration misuse.