I'm not sure how this would work in practice. Many sites allow infrequent visitors to view content free of registration and charge; or have specific articles which do not require registration. Sites which require registration might work in reader mode, or with javascript disabled, or with some components not loaded. For these reasons and more a submitter may not know whether registration is required.
In this particular instance, without your post I never would have known registration is required. Because, by whatever mechanism, I can read the entire article.
In this particular instance, without your post I never would have known registration is required. Because, by whatever mechanism, I can read the entire article.