Don’t think extradited, but US would try to garnish/seize money going into that account, which is why foreign banks don’t want to deal with the hassle of having a US customer. The extra legal requirements to have an account for you is just not worth it to them. The exception is only when you have a great deal of money, and then they can actually make money from your deposits. But then that amount of money in a bank is a sure sign you don’t know how to manage your money.