See, it turns out that the Rabbit R1 seems to run Android under the hood and the entire interface users interact with is powered by a single Android app. A tipster shared the Rabbit R1’s launcher APK with us, and with a bit of tinkering, we managed to install it on an Android phone, specifically a Pixel 6a.
Edit: Someone also got doom and Minecraft running on this thing
Note that this is mostly due to the closed source drivers and nonexistent Linux support for smaller SoCs. Some manufacturers are quite good in that front (e.g. Broadcom/Raspberry Pi, Rockchip), with others you're lucky if they allow you to use Linux at all, with no GPU drivers (which you often have to pirate the binaries, thanks ARM for making Mali a completely closed source project from its open source origins).
Broadcom is also closed source (I think). I have to use closed source drivers for my broadcom wireless adapter on Linux.