Most major news sites, as well as some other sites of reading content like Medium, have a paywall for certain articles, but those are easily defeated by people who bother to search the internet.
As I suspect said companies are aware of that, and they don’t react to properly protect their paid stuff, what do they expect to gain?
Because fundamentally DRM doesn’t work. It’s effectively impossible to stop a determined attacker from gaining access to the information while also making it easy and convenient for the general public to access.
The point of pay walls is to be just annoying enough that 90% of the public go “screw it, have a few dollars”, not to stop the 10% of people who were never going to pay you regardless.