Unexpected Billing Account Association with My Google Cloud Project

Google Cloud Cloud Foundations & Onboarding
1

Hello Google Cloud Community,

I am trying to understand the billing behavior of Google Cloud Managed Projects.

I own a Firebase project and found an unexpected Cloud Billing Account association in its settings.

My Cloud Audit Logs show a successful AssignResourceToBillingAccount event on August 3, 2026. The principal recorded was a Google-managed service account associated with Managed Projects.

I would like to understand:

  1. Can Google AI Studio or Managed Projects automatically assign a Billing Account to a Firebase project?

  2. What is the purpose of this automatic association?

  3. Is there any official documentation explaining how project owners can identify the source of such an assignment?

I am looking for technical guidance to understand this behavior and the relevant Google Cloud workflow.

Thank you.

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