Worse yet, the OS itself is non-GPL, an OEM can modify Fuchsia outside just the drivers to support their device (eg: create a board support package) and never release their modifications to their customers, meaning the community can't compile their own updates to the software running on the device (worse than our current Android situation).
Unless the OEMs customize the whole stack to only allow the kernel to talk to their drivers. That is only enforceable by legal constraints from Google akin to the CTS [0].
