The Starter Tier for Google AI Studio explained

Google AI Studio's Starter Tier allows users to deploy a prototype online quickly without a payment method or billing account, using fully-managed services like Cloud Run, Cloud Firestore, and Firebase Authentication. This tier is available to individual Google Accounts and is designed for minimal configuration, with a simplified console experience. Users can get started with a live URL in minutes, but should note that Starter Tier resources have different terms of service. This tier is ideal for rapid prototyping and business applications, but may not be suitable for production use.