If the point of HN is sharing information, and having substantive dialog, then these links are counter-productive. If really think we should ban non-traversable links; if there are alternative links to submit that are the next best available summary or secondary source, I think that would be far preferable (and we can always relegate the primary paywall-ed source into the comment page).

Should I continue to "flag" paywall-only links as I see them, or just continue to gripe in the comments?