I keep hearing that here, and people have good reasons why they think of that but to me sideloading always meant having your phone physically next to the device you're pulling an apk from, in other words loading the app from the side.
Yeah, that strikes me as a familiar use also. They seem to be using it to mean not only that but any software installation that doesn't happen via the Play Store, so it's rooted in real history but also conveniently re-appropriated to imply it's veering outside of typically intended use cases.
