This new thunderbolt feature hilariously does what I once did with RS-232.

I already do.

There is one. It’s called “AirGuard” and it has been around for a while now. I’m using it on GrapheneOS.

GSF is where most of Google’s invasive user tracking happens. It’s proprietary, closed source and is not part of AOSP (Android Open Source Project). It is, by definition, spyware.

Google did not put it in Android. They put it in Google Services Framework. Ironically, GSF is the first part you rip out to protect your privacy.