Benedict Evans on all the kinds of devices that get counted as Android:
The important dynamic here is that a combination of very cheap off-the-shelf chips and free off-the-shelf software means that Android/ARM has become a new de facto platform for any piece of smart connected electronics. It might have a screen and it might connect to the internet, but it’s really a little computer doing something useful and specialised, and it probably has nothing to do with Google.
The answers to these questions are usually more complicated than they seem.
How do the economics of product design and consumer electronics change when you can deliver a real computer running a real Unix operating system with an internet connection and a colour touch screen for $35?
They’re puttin’ computers into everything nowadays.