The problem with Max Hardcore may be his website which allows anyone to access his movie trailers with no age verification system. I just watched some vile footage & even though I thought it was gross....it is not illegal.
The FBI also shut down 2 other sites: one was for stories only (but they involved child porn) and the other had something to do with soldiers posting photos of dead Iraqis.
I don't believe age verification systems are mandatory. Seems there was an attempt to make them into law but it was struck down as unduly burdensome. Most sites only make you click a link saying you are over 18.