Every time I see a "new big features" announcement from the big 3-5 cloud vendors (AWS, Google, Azure, etc). I keep hoping that one or the other is going to really buy in to IPv6. And I keep being disappointed.
There are some ways to get them playing moderately nicely with IPv6 (especially if you're buying load-balancing services from them), but most of their networks are IPv4 internal-routing subnets.
Meanwhile, the middle range VM places (Linode, DigitalOcean, etc) are far more IPv6 friendly. My understanding is that is because they use standard commercial networking gear. While the biggest clouds (AWS, Google, etc) have totally custom network stacks which trade affordable performance for full feature sets.
Between the cloud vendors poorly supporting IPv6 and insanity like the Cogent-v-Hurricane split of the IPv6 internet (holy crud... it's SEVEN years now since Hurricane baked Cogent that cake begging them to peer with the world's largest IPv6 network... and it's still broken), it's amazing IPv6 has as much traffic as it does.