Typically VPC to VPC peering will result in Egress charges, not with VMware Cloud on AWS! As long as your VMware SDDC and the AWS services you intend to use are in the same Availability zone there is no egress charge between the VPC. Say for example you want to backup a VM to S3. At some point you then need to restore that VM. The egress traffic could be huge, with this service you don’t need to worry about it.