I use F-droid on my Fairphone and Android tablet as an app store. The repository contains only Free and Open source software (FOSS). Other repositories can be include with it i.e. Guardian Project and IzzyOnDroid. I disabled many Google apps and services from my phone as I only want to run software I can see the source code of. In that way I believe I can protect my data privacy and reduce adverts. I don’t have banking software on my phone, I have no google account. I am happy with this setup.
This philosophy is under threat by Googles announcement in August that starting next year in will no longer be possible to develop apps for Android without first to register centrally with Google.
Here are a series of links on this topic.
The Register – Keep Android open movement
Google will require development verification to install Android apps
I think Halloween is an apt day to rant about the evil that Google has become.