MicroG has goal open source
MicroG (typically styled as microG) is a free and open-source implementation of proprietary Google libraries that serves as a replacement for Google Play Services on the Android operating system. It is maintained by German developer Marvin Wißfeld. In a presentation, Wißfeld described microG as "the framework (libraries, services, patches) to create a fully-compatible Android distribution without any proprietary Google components".Background
Although Google initially released the Android operating system as open-source software in 2007, the company gradually replaced some of Android's open-source components with proprietary software as Android grew in popularity. Marvin Wißfeld, a German software developer, created the NOGAPPS project in 2012 as a free and open-source drop-in replacement for Google Play Services, Google's closed-source system software that has been pre-installed on almost all Android devices. The NOGAPPS project became MicroG by 2016.