Trapped in the Cloud: AWS Vendor Lock-In and the True Cost of Amazon's Cloud Dominance

Amazon Web Services is the most profitable division of the world's largest retailer, generating over $100 billion in annual revenue with operating margins that regularly exceed 30%. AWS powers roughly a third of the internet's cloud infrastructure, from Netflix streams to government databases. But behind the impressive statistics lies an uncomfortable reality for the millions of businesses that depend on AWS: getting in is easy, but getting out may be nearly impossible. An OPV investigation into AWS's market dynamics reveals how Amazon has constructed a cloud ecosystem designed to make customer departure as costly and painful as possible.

The Egress Fee Trap

The most visible mechanism of lock-in is AWS's data egress pricing. Amazon charges customers $0.09 per gigabyte to move data out of its cloud — a fee that is many times higher than the cost of moving data in, which is free. For small applications, this asymmetry is negligible. For enterprises with petabytes of data accumulated over years of AWS usage, egress fees represent a migration tax that can run into hundreds of thousands or even millions of dollars. "They give you free ingress like a dealer giving you the first taste," said Marcus Rodriguez, CTO of a mid-size SaaS company that spent 18 months migrating from AWS to Google Cloud. "Once your data is in, they know you'll think twice about moving it." Rodriguez estimated his company's total migration cost at $4.2 million, of which egress fees accounted for roughly $340,000.

But egress fees are only the tip of the iceberg. The deeper lock-in comes from proprietary services. AWS offers over 200 distinct cloud services, many of which use proprietary APIs and data formats that have no direct equivalents on competing platforms. Companies that build applications using DynamoDB, Lambda, Aurora, or SageMaker face months or years of re-engineering to migrate those workloads. Amazon's solution architects actively encourage deep integration with these proprietary services, framing it as best practice. Only later do customers realize that each additional AWS service they adopt makes their eventual departure more difficult and expensive.

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Regulatory Scrutiny Intensifies

European regulators have taken the lead on addressing cloud lock-in. The EU Data Act, which took effect in 2025, includes provisions requiring cloud providers to eliminate egress fees for customers switching providers and to improve interoperability between platforms. AWS has begun complying with these requirements in Europe, offering free data transfer for switching customers — a tacit acknowledgment that egress fees served a competitive rather than cost-recovery purpose. In the United States, the FTC has included cloud market dynamics in its broader examination of Amazon's business practices, though no specific rulemaking on cloud interoperability has been proposed.

The Power of the Default

AWS's dominance is self-reinforcing. Because so many developers are trained on AWS, hiring AWS-skilled engineers is easier than finding expertise in alternative platforms. Because so many third-party tools integrate with AWS first, the ecosystem around AWS is richer than its competitors. And because AWS was the first major cloud platform, it benefits from over a decade of customer inertia. Companies that want to leave must fight against not just technical and financial barriers but organizational ones: the institutional knowledge embedded in their AWS architecture, the staff certifications tied to AWS, and the simple human preference for the familiar. Amazon did not build the world's largest cloud business by accident, and the mechanisms that keep customers locked in are as deliberate as they are effective.