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Not every service supports IPv6. Some big ones are APIGW and Lambda.

For RDS, you have to set up your instance as dual stack explicitly even if you’re deploying it into an IPv6 subnet.

whoa! really APIGW and lambda are not ipv6 compatible ?

i was planning to deploy an internal developer platform (think local PAAS) using lambdas behind an api gateway. no ipv6 there ?

Lambda does support private IPv4 networks though.

TBH, not supporting IPv6 in this day and age is just unconscionable.

not when comparatively nobody uses it

All US mobile ISPs (which are 100% IPv6 and use NAT64 to access v4-only servers!) are “nobody” to you?

Many fixed-line ISPs also only provide v4 over DS-lite or similar, these days.

There's no incentive to use it when IPv4 is free. There are two main ways for network providers to move the needle, assuming that they actually offer IPv6 as an alternative:

(1) charge for IPv4

(2) move IPv4 behind CGNAT

This explains a lot. I wanted to be a good citizen and use IPv6 exclusively internally and keep IPv4 at the edge, then I found I couldn’t create a database without a bunch of IPv4 settings I hadn’t configured.

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