Actually, this has been done twice. Recently by the open microG project, and earlier by Amazon. Reimplementing every Google Play service, bug for bug, bit for

Actually, this has been done twice. Recently by the open microG project, and earlier by Amazon. Reimplementing every Google Play service, bug for bug, bit for bit. And Amazon did it (and microG is close). This is what prompted Google's SafetyNet project, and Google changing Chromecast to lock out Amazon and open source projects. Google did everything they could to prevent competition, and yet, they didn't succeed.