[TheCoelacanth]

So if a users presses a button that says "Do X":

Then the app sends a request to a server to do X and based on the response looks up the text that shipped with the app saying "X completed successfully" which it displays using the system font, that is fine.

Then the app sends a request to a server to do X and the server sends back the text "X completed successfully <smiley-face-character>" and the app displays it using the system font, that is fine.

Then the app sends a request to a server to do X and based on the response looks up the text that shipped with the app saying "X completed successfully <smiley-face-character>" which it displays using the system font, that is against the rules.

That seems incredibly arbitrary and nonsensical if that is an accurate description of the rule.

[wlesieutre]

The minor use that occurred to me is Slack's "You're all up to date :tada:" when you pull up at the bottom of a channel to load new messages.

Another link was posted suggesting that Apple's reversed this stance. If not for that, would Apple have been making Slack get rid of the party popper because the user didn't type it? It sounds like yes.