Most machine learning in use today is “train once (and maybe finetune) and then deploy“, not online, continuous learning. I don’t think the frequency of model updates is generally a good indicator of whether or not something is considered machine learning.

More to the original point, nowadays when most people thick of machine learning they are thinking of deep neural networks, whereas Google‘s original pagerank was very simple and shallow by comparison. But they built an algorithm that allowed machines to learn what pages were high value and what pages were low value. If that seems simple by today’s standards, it’s evidence of the AI goal posts moving more than anything else.