Project ID 0 is the default project that loads automatically when no project ID is passed in the unlayer.init() function. This fallback project is intended mainly for testing, quick demos, or basic editor usage without a full project setup.
For users operating under Project ID 0, the usage limit is:
50 GB lifetime bandwidth cap that does not reset.
Once this limit is reached, assets under Project ID 0 are permanently restricted and will not be restored. Unlike standard free plans, there is no automatic recovery at the start of a billing period. The path forward is to upgrade to a paid plan and use a real project going forward.
For production environments or any use case beyond initial testing, it is strongly recommended to specify your own project ID to avoid these permanent constraints.