Who defines what constitutes "reasonable effort"? How would you even know without having them go through a legal process like a court? Is it just up to any angr

Who defines what constitutes "reasonable effort"? How would you even know without having them go through a legal process like a court? Is it just up to any angry journalist to make this determination? I personally wouldn't use PornHub, as I have a negative impression of their moderation standards. Being exposed to child porn could put me at serious legal risk, if I were to inadvertently view the wrong thing. But, that is a simple risk calculation on my part. And I am already surprised so many people would put themselves at risk, of using a website which lets anyone to submit content.