Printers print very small dots on the sheet of paper you print so it canbe identified. https://en.wikipedia.org/wiki/Machine_Identification_Code

This makes me wanna get my Sony DSLR and start taking photography lessons again, this is awesome!

By far windows, windows lacks or doesn’t fully utilize features like full verified boot, sandboxing which means even if a program installs itself it still has to ask for permission for mic, camera, etc. Adding on to the issues even the programs themselves can be unsafe. Running a program that uses a memory safe programming language is pretty rare and a lot of vulnerabilities come from memory allocation and buffer overflow bugs. Android attempts to mitigate these issues by sandboxing every app, all phones ship with verified boot and full disk encryption, and usually have a memory allocator of sorts. And if you run a degoogled ROM you’ll mitigate the privacy issues by not having Google play services installed.

If you need some way to monitor these devices as an admin there are apps on android that allow this functionality, iOS has similar admin features.

edit: typos edit 2: added information

We live dangerously around here >:)

Me when I run sudo pacman -Syu