Also video game AI’s. I like to use that as a quick test of a definition of “AI” because video game AI’s span a very wide range of levels of sophistication as well as algorithms, many of which look like deterministic decision trees, most of which don’t use any ML or even regressions.

Arguably that’s a different overload of the term “AI” the way it’s used in business, but I think it’s a good reminder that AI as a field has a long history that developed separately from ML and data science.