Quoted from Buju:They can ignore the "where's the money lebowski" emails, but they can't ignore legal proceedings if brought
Depends...you’d have the serve them somehow, will be harder and more expensive than you are thinking. If you managed to serve them and they didn’t bother to answer and you got a default judgement (which is likely your best case scenario) you’d have to domesticate it over seas, will be harder and more expensive than you are thinking. If you domesticate it you’ll have to collect it, there may be little or nothing to collect and they may bankrupt anyway.
They may have little fear of US based litigation.