From my corner I hear a lot of grumbling from devs about Google's terrible Android SDK, poor documentation, buggy releases, flaky and buggy tools.
"“Our goal is to make Windows 10 the most attractive development platform ever,” Microsoft executive Terry Myerson told an audience"
I never felt that was Google's priority with Android. Its just that terrible.
Developers not strictly of the F/OSS mindset would probably try Windows development just for some new scenery, if their tooling was that great and they had more market share.