How about using AI for sports betting?
FiveThirtyEight often tries to model sports mathematically, and their predictions are very often wrong. There are way too many intangibles in sports.
I don't think they are intangible as much as probabilistic and inaccessible.
You can get your hands on every one of those factors, but doing that is akin to "getting together the energy to send a vessel at .99 of C: it's possible but not plausible.
The problem is that there just simply is not any way to model all that short of re-creating a whole universe just to look at that one part of it so you can know the outcome before it happens, assuming you don't significantly change anything on the lineup to that outcome.
There's no useful model for lover's spats in hotel rooms before games, or for when a player is going to go through an identity crisis on the bench, or for when fans will provide the energetic encouragement to actually sink that basket or hit that ball... or provides the distraction that prevents it.
There are too many inaccessible forward causes with too much influence fun the result for a sports game to be usefully predicted.
In all honesty, horse racing seems a better use of your time and even then as a normal bet placer you lack the information you would need to get the system to solve, things like "what did the jockey eat" and "what hotel are they sleeping in" and "what is their relationship with their girlfriend right now?" And having a model for how those things impact performance.
Then, maybe I'm also being a little extreme on my treatment of "intangibility", but I do take issue with the idea that anything is in fact truly intangible other than perhaps the laws of physics themselves.