And ditto for MS's and Sony's Gaming Consoles if one can only game on them and owners not allowed instillation or use other Applications like Blender 3D, Gimp, Krita, Inkscape, LibreOffice etc!

Apple's M1 based tablet that's not allowed to use MacOS and end users restricted to that closed ecosystem.

It's really time once again for active Antitrust enforcement there and all of theses locked down devices and the search engines that are mostly useless now for any productive research or unfettered usage.

Sideloading on android is specifically taking an apk on your PC and installing it on your phone over ADB (there's an `adb sideload` command). For whatever reason, people also wrongly use the term to refer to just installing apps from files outside your app store, even when it's all on the phone.

I also often see people try to either use the jailbreak term for Android or change it to root, but with the same wrong meaning, but there is no jail, you don't need root for much, and it's also unrelated to unlocking your bootloader and flashing a custom ROM. Even a fairly-locked-down Amazon fire tablet lets you grab the F-Droid apk and install it. It's just normal.

Bit of a tangent probably. I also agree it shouldn't seem normal to people to not let users use their computers for whatever they want.