Gatsby Cloud serves as an efficient solution for reducing build times and associated costs for sites built with Gatsby, particularly as they scale or require frequent updates. This platform offers incremental builds, which means only the parts of the site that have changed are rebuilt, significantly cutting down on the "time to build" and thus saving on resources such as hosting minutes. Moreover, Gatsby Cloud supports managing multiple sites from a single monorepo, allowing for streamlined workflows and easy integration with services like Shopify via webhooks. This capability is particularly beneficial in e-commerce scenarios where inventory and product details change regularly. The platform is positioned as a powerful tool for enterprises needing fast, secure, and SEO-optimized sites without the traditional drawbacks of server-side rendering, making it a valuable asset in modern web development.