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Toomanyuserprofiles I have been using it for the lack of better alternative and unwillingness of my loved ones since I installed GrapheneOS. Without major problems. If you don't use Play Services, with unrestricted battery it gives reliable notifications. I found out that when I experimented with installing/uninstalling Play Services with Whatsapp already installed, it breaks notifications so had to reinstall a few times. Never pursued the area of backing it up, always fresh install. It is a solid messenger and if it puts your mind at ease, LibChecker says it contains no google libraries so IPC with Google apps/apps containing google libraries is unlikely. That is on device side and it doesn't mean it will not collect certain data for the purpose of server-side analytics (possibly Google linked). This not an expert opinion of course. I am looking for a better alternative and any recommendations with reasoning are welcome.