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Android won't kill sideloading after all, but new verification rules will make it harder
(www.techspot.com)
This is a most excellent place for technology news and articles.
Couldn't they just refuse to sign shizuku and you'd be stuck in a recursive loop of needing a pc anyways?
Then you'd need to run adb once for the first install of fdroid/shizuku. Admittedly not great, but doing that once will not stop many OSS enthousiasts. It would widen the gap between power user and normal user considerably which also isn't great.