Amazon used AOSP to create tons of their products. Even if most Android devices have the Play Store, there are successful variants that don't. And I'd even include Meta's Quest line here: every headset since the Go has the ability to sideload apks using standard Android tools.
My quest (1) I bought on launch day got an OS update and now I have to find my old credentials to log in (and thus accept some (probably) draconian EULA, just to enable developer mode to side load apps on there. You can't just plug a USB stick in the side and copy paste them to "side_loaded_apps" dir it's still a ridiculous task of doing backflips through flaming hoops to use it as an open device. And it may yet again reset my login.
