If you want to draw a line you could say anything that’s not full AGI isn’t machine learning because of philosophical reasons. But, other than that there’s the

If you want to draw a line you could say anything that’s not full AGI isn’t machine learning because of philosophical reasons. But, other than that there’s the only clear line is when the programmer isn’t hard coding results which puts Linear regression over the ML line. I guess you could argue about supervised vs unsupervised algorithms, but that’s going to exclude a lot of what is generally described as ML.