The lawyers love the American Regulatory Model because it requires lawyers for you to do an ICO. The easiest model is just restrict any offering to US persons only if they are Accredited Investors or ban them completely from participating. Problem solved, now you don't need a lawyer.
At the same time a lot of ICOs dont want to do this because they believe that they are limiting their chances of reaching their Soft/Hard caps if US investors dont participate. So people will continue to have 'ICO lawyers' who do nothing