When you become dependent on a specific cloud provider's proprietary services and switching to another provider becomes difficult or expensive. Like building your house with custom parts that only work with one supplier.
Using AWS-specific services like DynamoDB and Lambda heavily can create vendor lock-in, making it costly to move to Azure or Google Cloud later.
These services are similar in functionality, offering serverless computing and NoSQL database solutions, but each has unique features that can lead to vendor lock-in.