Many Paysites have them because they merchant bank/3rd party processor they use requires them.
As others have stated, law wise in America, it's down to a good faith effort.
A little trick is to put the main site on a sub domain and put the warning page on the root of the site, then only link to the sub domain This way your link building efforts don't list a warning page in the engines - yet typing in the root of the site returns the warning page.
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