There’s no way Apple lets the automaker access app data from your phone. Apps on the phone can’t even see data from other apps on the phone.

There are two ways I can think of for the infotainment to get the messages. The first is by OCR-ing the CarPlay screen, which is shady as hell. The second is a feature like this one where the car has Bluetooth notification integration.

And of course there have been forges launched, including SourceHut, Gitea, Gogs, Forgejo…

Not Plex, but yes. I use it with Microsoft Remote Desktop if I need to access a work-related computer that I keep at home while traveling.

I also use it for the more typical use case of a cloud server that I can ssh into even though it exposes zero ports publicly.