The more mobile traffic, the more IPv6. Have a look at India, it is not as if everyone has a fibre connection running IPv6.
Here in Belgium it's the other way around. we've had IPv6 for over 10 years for basically all home internet, but mobile is still ipv4 only. Not sure why since it's all the same companies.
I'd however mention, the two biggest ISPs that remain today both have adopted IPv6 on their fiber connections. They're also heavily using CGNAT for IPv4. It makes sense, the volume at which they're working makes dedicated IPv4 very uneconomical.
My home internet has IPv6 but my mobile carrier doesn't. IPv6 on mobile carriers is unfortunately still not universal.
Well, France has 99% IPv6 deployment through both mobile and landline these days
https://www.arcep.fr/fileadmin/reprise/observatoire/ipv6/Arc...
(2025, from 2024 data)
Reason that Google isn't seeing more is a) some BigCo v4 holdouts b) happy eyeballs sometimes landing on v4 because their v6 is shitty 6rd or something (e.g Free SAS)