Yeah, and Heroku too. Don't know how they going now, but 5-7 years ago were their popularity was crazy.
In what way does getting your artefacts through ipv4 annoy you?
It means I can’t do a fully ipv6 backend, which is a bit irritating.
Why do you need ipv4 on your backend to reach ipv4 destinations?
NAT64 is NAT with all its associated annoyances and bugs, and proxies/caches are just annoying to maintain and a needless added point of failure for small installations.
If you have an bunch of servers using ipv6 to avoid NAT issues.