The crate doesn't perform plotting, it only does a ureq HTTP call to the author's web service for data visualization.

I found it a little overwhelming too. I was hit with an add 3 times by the time I hit the bottom of the article. Kind of too aggressive in my book

it's a free article taken from the book using a free rust crate which has a pro version

it's a long running series of numerous high quality articles

Nothing wrong with that as long as the article is still useful

this is the hn way