Identify and remove any unused VPC Internet Gateways (IGWs) and VPC Egress-Only Internet Gateways (EIGWs) in order to avoid approaching the service limit (by default, you are limited to 5 IGWs and 5 EIGWs per AWS region). An Internet Gateway/Egress-Only Internet Gateway is evaluated as unused when is not attached anymore to an AWS Virtual Private Cloud (VPC).