The same goes for medium.com. There are good articles on Medium, but 95% of it is low-quality or spam, so I generally avoid these links or come in with the expectation that an article is likely spam.
I do wonder how Substack is thinking about this problem. They obviously have a different business model than Medium, but I think they are still susceptible to this issue.
It's super unfortunate that the best place to write is also the place most blocked. HN isn't the only one. Reddit also by default blocks dev.to. There are plenty of low quality articles on both sides.
I think the moral of the story is that there is too much garbage out there and a computer algorithm is incapable of making the distinction. HN is fine risking being behind the curve if it saves it readers from wading through it. That's a fine tradeoff but means it leaves things on the table.
Articles that are regurgitated help docs for example. Another example is nearly anything that is tagged #todayilearned.
Too much noise, not enough signal.