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An AWS account can only have 1 default VPC surely?
You can reference the default VPC using the crosswalk API (probably other methods, this is the one I know about)
<https://www.pulumi.com/docs/clouds/aws/guides/vpc/#getting-the-default-vpc>

Ok, I remembered there is a VPC per region. So what you'd do is create a list of all regions you care about, perhaps using something like <https://www.pulumi.com/registry/packages/aws/api-docs/getregions/>
and cycle through them, deleting the VPC each time.