Make a Storage Bucket Public
The simplest way is to assign the AllUsers IAM role to the bucket. This makes it accessible for All users, regardless of their source.
What if I want to still block / restrict access to this bucket at a network level?
VPC Service Controls will help you define a perimeter around the bucket, so that only authorized perimeter bridge resources can access it. More on VPC Service Controls
Summary
Cloud storage bucket has several access control mechanisms - including IAM, ACLs and VPC Service Controls.
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