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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.
Even calling it side loading is an attempt to delegitimise the practice. To make it sound like you're doing something dodgy by the side.
It's just installing an app.
Nobody calls installing an app from outside the Microsoft store on their Windows PC "side loading".
Likewise for Macs regarding their app store, or installing an app from outside your distro's repository on Linux.