No it would be implemented by the app. The purpose is to increase security so in case someone gets ahold of your phone while itβs unlocked, they wouldnβt be able to open Voyager and get access to your account.
I see the value, but I suspect this isn't a feature Voyager needs because the only apps that have that feature are password managers, banking apps, and Telegram/Signal --- that is, apps that are end-to-end encrypted and privacy-focused.
I think the value here is to add an extra layer of disconnect between me, the person and me, the lemmy user.
Someone can easily profile me, the lemmy userβs profile; but no one in real life needs to know me, the person, have a separate private lemmy account used for less than above the belt content. Having an extra layer of authentication doesnβt guarantee it, but makes it harder for someone to swipe my phone and poke into that.