No, no, and still no. Installing an app on an Android device you've purchased and fully own is not "sideloading". It's just... using your device. Nothing more. Let's not pretend even for a second that "sideloading" is a normal term to describe this.
@zsmb13 We don't "sideload applications" on our computers, we "install programs". Our phones are just computers with a cellular card and shouldn't be treated any differently. Just because something doesn't come from Google's Store doesn't mean it is different and requires a special name, it's all software and Google can't even guarantee the safety of apps on their Store, users still need to provide caution whether an APK is from the Google Store, another application repository or from some website.
Even my phone's autocorrect agrees and refuses to accept "sideload" as a real word.

