The HN FAQs [1] state that paywalled articles are OK as long as there is a known workaround so everyone can read it, even with a little effort.

Someone usually posts a link to the workaround in the comments: https://news.ycombinator.com/item?id=22800580

It's not ideal, but better than banning every site that might ever have a paywall, which, aside from leading to the loss of a big chunk of quality content, would create confusion relating to the fact that paywalls behave differently based on regions, previous site visits, click origins etc.

So it's the least-worst solution.

[1] https://news.ycombinator.com/newsfaq.html