Easy there.. I was not advocating any OS/instance level changes by Google. It is just that GCP seems to abstract away concepts like internet gateways and NAT instances, perhaps making the switch to IPv6 on GCP easier than AWS.
AWS used to as well. However, that doesn't work if you're an enterprise moving legacy systems up to the cloud that expect certain network addressing schemes.
Amazon.com itself didn't move to AWS until VPC supported the bring your own address primitives. Not everyone can clean slate rewrite systems to bring them to the cloud, Amazon recognizing this is going to keep them dominating the market.
