Sure, some sites limit who can view them based on visitor preferences. Analogy: Some restaurants have a "no shirt, no service" policy. It would be ridiculous to impose a blanket ban for all people on such restaurants just because you refuse to wear a shirt.
If you want to pick a more sensible fight, try going after links to paywalled sites (whose content is blocked through their decision rather than mine). However, bear in mind HN policy already has those covered: "It's ok to post stories from sites with paywalls that have workarounds."