Sorry Mike. I merged Kane's comments about the under 15 at the mindgeek sites -- I had a brain fart -- that COPA comment was misdirected.
Paul -- the US can't in the foreign courts when there is not corresponding law in that country.
- What the US can do is try to 'firewall' any site not complying with US laws.
- There is something called a "long arm state statue" in the US federal Court Districts. However, this is rather narrow and probably would not work -- if it did work; if your server was in the USA the court could accept an in rem action (action against property -- not a person personally served) -- resulting in the seizure of your server and any other assets in the USA, or controlled by a USA business like VISA and Mastercard.
- The US government could order VISA and other credit card associations as well as US based money center banks and foreign banks operating in the USA not to do business with you -- VISA is global but US owned so such court order would apply to their foreign operations -- this is how they crippled backpage.
As far as the independent cam girls -- they are to be left to their own means.
A basic sitebuilder is very doable. RTFM, that is their training. They could make a deal on their own to pay for help -- like a webmaster to assist them or to engage their own affiliates and set the split.