I really hate the term “side-loading.” We shouldn’t need a word for the normal way we’ve been installing apps for the past 40 years. If tomorrow Apple decided they were going to start only letting you visit web pages they approved of, we wouldn’t call some sort of alternating system that let you see *the rest of the fucking internet* “side-paging”. We’d instead call the whole thing bullshit.
@tolmasky yup, they should do how Valve does it, e.g., on the SteamDeck they are merely called "non-Steam games".
Google should call them "non-Play store Apps", and Apple should call them "non-App store Apps" (but that will ruin the illusion that apps can only ever be found there)