HN's policy [1] (in place for several years) is that articles are only allowed if they can be read without a subscription.
Paywalled sites are OK, if there is a known workaround - usually someone will post this in the comments.
If the paywall is impenetrable for that article, it shouldn't appear on HN, and you should flag the post and alert the mods via email (hn@ycombinator.com).
By the way, you'll get negative reactions to complaints like this, as this question has been raised and discussed countless times before on HN, and people get bored of seeing the same discussion over and over. The policy HN has adopted is considered to be imperfect, but the least-worst option.