So the question: why does HN not a bot to automatically detect and add a non-paywalled link automatically? Is it to DMCA issue?
"Posters gonna post, yo; what's a brother to do, bruh?" Is a defence in court, but "yes it's our software, your honour" is admitting complicity if not culpability.
https://greasyfork.org/en/scripts/452024-hacker-news-anti-pa...
It doesn't get rid of them. But marks them, so you don't waste time clicking. And also provides a bypass link, if one exists.