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Google CEO Sundar Pichai Warns Android Users Not to Sideload Apps
(www.gizmochina.com)
This is a most excellent place for technology news and articles.
That's 100% the reason it caught on.
People around here seem to really really like saying it.
There is some perception bias there, because you won't hear that much from people who don't want to use the term (like me), unless they engage in a pointless meta-comment like this one.
That's fair. I personally hate it, but I see it in almost every thread about what big tech is up to.