If you're asking how one would do that at a technical level, I imagine they would use HTTP Referer info [1]. Essentially they decided if someone was being refe

If you're asking how one would do that at a technical level, I imagine they would use HTTP Referer info [1]. Essentially they decided if someone was being referred to WSJ.com by a search engine, then show the whole article, else show the paywall. [1] https://en.m.wikipedia.org/wiki/HTTP_referer https://en.m.wikipedia.org/wiki/HTTP_referer