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A mistrust of apps is not a bad thing. The majority of them exist only to exploit their access to your device for DataFarming purposes (see my recent post about ZipoApps).
That's why I'm so fussy about installing phone apps only from F-Droid. Where they've been rebuilt from source code and checked for spyware, which they either remove, or at least flag (eg if the app is tethered to a DataFarming remote service).