A large number of people are using it as an opportunity to promote using operating systems which are the direct opposite of hardened and are much more heavily using AI models including for a lot of code generation.

LineageOS is certainly using it. CalyxOS, /e/ and iodéOS are based on it. CalyxOS is developed by LineageOS core developers.

https://grapheneos.social/@GrapheneOS/117243278117231129

I’m trying to figure out which model they used based on the style of the UI, but I can’t quite pin it down.

The EU’s AI Act calls them open source, so that ship has sailed.