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ASUS is apparently killing the ability to root present and future Zenfones
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
It's been this way since I first flashed a custom ROM on my 2011 Xperia and I've never gotten it. It seems so useless. Either Huawei or Xiaomi wanted me to provide a REASON for unlocking.
I think Nexus phones were unlockable without making a request to a server. I might be wrong though. But I do miss the Nexus line.
Pixel devices don't require permission via a server. Unlocking is enabled via developer settings on the device.
Doing it any other way is user-hostile.