This is in the FAQ at https://news.ycombinator.com/newsfaq.html and there's more explanation here: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...
It's not a perfect or even particularly good solution but it's much better than banning all the sites with soft paywalls or any other solution I'm aware of.
Also I'm not quite okay with asking a 3rd party to spend resources on something what could be not even used.
Also there is archive.ph link in a comment made 45 minutes before your comment.
For example, we already have suggestions for videos and PDFs in the guidelines:
> If you submit a video or pdf, please warn us by appending [video] or [pdf] to the title.
Of course, I'm not sure what a name for that tag might be, [paid link] or [paywall], though those might have negative connotations. Just a thought.Edit: dang also linked the FAQ and previous discussion of paywalls above, it seems a solved question.
Perhaps I have paywall free access because I took their "Not ready to subscribe? Tell us why" survey a while back?