What an amazing article, I literally just posted one about free software vs. proprietary myself. I love seeing that you care about these issues too. I would like to add that you have setup an amazing system, however it is not perfect. My friend did an extensive study on Lineage OS and the problem remains, that still too many android functionalities run on underlying proprietary components. In particular, there is one closed library that called by 70% of Android services, however I have misplaced its name. The hard truth is that all smartphones have a backdoor these days. Still, I support your "un-Googling" procedure and would advice anyone to follow your lead. I will read up on microG too.

Snapchat might not use Google Services but boy do they love to collect data themselves ;)