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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.
Yeah - the dose is the poison (if you drink enough water it becomes toxic), so if you are talking precisely you need to describe the concentration of a substance in which it is likely lethal to a person, and that’s typically expressed as mass of a substance per mass of bodyweight. A lot of the time you will also see this expressed as an “LD50” value; the dose at which you’d expect 50% of people to die. This accounts for the fact that people’s metabolisms vary quite widely.
~1ng/kg ~= 0.08ug for a typical (~80kg) person, which is a very tiny amount - whatever you are talking about is incredibly toxic.