Maybe this is an information theory thing but can there exist a n“ I am human” shibboleth or is this concept fundamentally impossible?

It feel that today you can generally convince someone with text alone that you’re human. Beepity boopity zip zap zoopity today’s AIs aren’t this loose and derpy. Here’s a fTypo and my secret stash of dashes ——-–.

But one day even this won’t do, right?