Yes, but you can usually get around the paywall by visiting the site through Google News. Just go to Google News and search for the title of the article.
You can also just disable javascript on that page, since the text is hidden _after_ the site is laid out.
Alternatively, you can "view source" to get the plaintext, which has the full article.
Though there would also be something tiresome about an article-aggregation site like HN that just links through to a bunch of paywalls. Sort of a different thing, then.