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 It simply provides another download option via Google Play. But you can also download the APK for installation from Zapstore and GitHub. 
 Does the version on Zapstore not use GMS? 
 Well, I don't have Google Play Services installed, and it seems to run fine so far...

And thanks  @water783 - you also turned me on to #Amber to help broker private keys 😃  
 It’s not using any GMS API if I haven’t missed any code. Even for FCM push notifications, it’s using FOSS-FCM.  

https://codeberg.org/UnifiedPush/android-foss_embedded_fcm_distributor. 
 Ah...so it doesn't require GPS (and will run without it)...thanks.

Downloading the APK from GitHub via #Obtanium will work for me.

😃