True. All the big OEMs are in too deep with Android now, there's no going back. They could easily make it code share under NDA instead of open source.
Huawei proved that they can move away from Android... unfortunately they did not go for a hard fork of AOSP but for a proprietary, new OS.
Huawei proved that they can move away from Android... unfortunately they did not go for a hard fork of AOSP but for a proprietary, new OS.