Got any citations for that? The first time I personally ever encountered the term "sideload" was at a Microsoft developer demo for the upcoming Windows Phone around 2010, and another audience member raised his hand to ask what that term meant.

right but sideloading means installing outside the official channel. last i checked playstore was an option, not android official.

That is untrue. It's called "installing" or just "running". Sideloading makes no sense if you describe normal installing that way. The side load is the app store.

Not for apps and games on most phones.

I made these and we installed them as JARs or Whatever Symbian used.

No, we called it installing software.

Lol, no.