sounds a bit of a xy question imo, and a good answer of examples would depend on the y part of the question, the whatever it is that (if my guess is right) your friend is actually looking to know/find
“AI” is branding, a marketing thing that a cadaverous swarm of ghouls got behind in the upswing of the slop wave (you can trace this by checking popularity of the term in the months after deepdream), a banner with which to claim to be doing something new, a “new handle” to use to try anchor anew in the imaginations of many people who were (by normal and natural humanity) not yet aware of all the theft and exploitation. this was not by accident
there are a fair of good machine learning systems and companies out there (and by dint of hype and market forces, some end up sticking the “AI” label on their products, because that’s just how this deeply fucked capitalist market incentivises). as other posters have said, medical technology has seen some good uses, there’s things like recommender[0] and mass-analysis system improvements, and I’ve seen the same in process environments[1]. there’s even a lot of “quiet and useful” forms of this that have been getting added to many daily use systems and products all around us: reasonably good text extractors as a baseline feature in pdf and image viewers, subject matchers to find pets and friends in photos, that sort of thing. but those don’t get headlines and silly valuation insanity as much of the industry is in the midst of
[0] - not always blanket good, there’s lots of critique possible here
[1] - things like production lines that can use correlative prediction for checking on likely faults
you are not tall enough for this ride