There are several reasons why companies can benefit from using YugabyteDB Managed REST APIs, including automating the deployment and management of databases, reducing the time needed to bring up applications from hours to minutes, and providing a seamless experience for developers. The APIs offer features such as easy onboarding with account and project IDs, well-structured documentation, consistent API endpoints, versioning, fault-tolerant design, scalability, and security measures like API keys and auditing. Additionally, the APIs are designed to be easy to debug and provide support through a Slack community or email. Companies can benefit from using these APIs as they are kept simple, resourceful, secure, scalable, and maintainable, increasing developer efficiency and making it easy to build applications.