So what would this company's response be if they were contacted by an agency or copyright holder asking for a user's ip? Would their response be "we don't log user ip addresses so we can't provide the information"?
Correct. They are not the only one's that do this. Because the US doesn't have a set laws for data retention, they don't have to keep logs if they choose not to.
I have their yearly plan. They work pretty well.