Unfortunately in Apple's App Store Review Guidelines, you have: "2.9 Apps that are "beta", "demo", "trial", or "test" versions will be rejected" Of course, people do have "Lite" versions with fewer features, but I guess there was some vague "threshold of usefulness" that they wanted to impose with this rule. Anyway, although I can find the word in the store, I think its use gets avoided due to this restriction. (And I know the article is about Google, but you used the more generic "app stores" so I'm replying to that)
https://developer.apple.com/appstore/resources/approval/guid...