> At least on HN I still know what NLP stands for…

Neuro-Linguistic Programming?

I agree that the abbreviation ML is too ambiguous to be useful in a title without added context. This title is particularly misleading due to its lack of context.

https://en.wikipedia.org/wiki/ML#Computing_and_mathematics

> use the original title, unless it is misleading

https://news.ycombinator.com/newsguidelines.html

We are agreeing that ML as an abbreviation on HN can be misleading.

Is there a "standard" for machine learning that's regularly capitalized?

Title case.

Title case is inherently misleading and, therefore, should not be used.