It would be the Android-style Tivoization, where you get the OS on the device you buy, and if you are lucky the vendor publishes their kernel on an obscure part

It would be the Android-style Tivoization, where you get the OS on the device you buy, and if you are lucky the vendor publishes their kernel on an obscure part of the website, but without certain binary drivers. You may find you can't actually do anything useful with the sources because of those missing drivers and because the bootloader is locked to only accept new software signed by the vendor.