Comment by pmontra

There are many paywalls that send all the content in the html and then hide it with a script.

However there are many more properly implemented paywalls that send only a few lines of content and you don't find the content even on the archive sites.

There are several variations of those schemes. Sometimes there is text but not images. Sometimes the first party js is fine and you have to block some of the third party js.

Sometimes the content is in a JSON blob.

Sometimes the reader mode trick works but only for a short while before the js paywall removes it (the sibling comment hints about it.)

You have to experiment with each site.