According to their website, this is a direct response to the UIGEA. "The US government has recently introduced new legislation in the form of the Unlawful Internet Gambling Enforcement Act. To best protect the interests of NETELLER members, employees, shareholders and business partners, NETELLER will no longer provide service to US members to transfer funds to and from online gambling merchants."
They fail to mention the direct correlation between this action and the arrest of two founders and former Neteller executives in the US this week. Stephen Lawrence and John Lefebvre were arrested in US airports this week in the culmination of an FBI investigation that has been ongoing since mid-2006.
US Neteller customers that have funds in their accounts "may keep their funds safe in their account or are free to make withdrawals at any time they choose with a NETELLER Card. US members are not required to withdraw their funds from their NETELLER account," according to Neteller on Wednesday.
US customers are not barred from using the Neteller service, they are simply barred from making transfers to gambling sites. Peer-to-peer transfers and purchases from non-gambling websites are still open to US customers.
For the purposes of this rule, if you had a US address when you registered with Neteller, you are a US customer, regardless of citizenship or current address. As of Wednesday, January 17, Neteller was not accepting new US customers.