Paywalls are annoying, but such comments like this only add noise, so please refrain from injecting that into the thread. This is in the FAQ at https://news.ycombinator.com/newsfaq.html and there's more explanation here:

https://news.ycombinator.com/item?id=10178989

https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme...

Are there other forms of copyright infringement HN encourages or is this the only one?

This is such a common phenomenon that you can expect people sharing links to non-blocked websites after a short time. Next time just be patient and read the comments.