You trade US futures markets, you accept their jurisdiction. You don't, you don't trade them - pretty simple equation.
The CME and ICE US Futures both issued a disciplinary notice with the same result - permanent ban from their markets, all of them. There is an interesting difference though - while both came down to the smae type of rule violation, they differed in the underlying detail.
The CME (NYMEX) issued a very simple notice here. The rule violation cited was Rule 432.L.1 -
"To fail to appear before the Board, Exchange staff or any investigative or hearing committee at a duly convened hearing, scheduled staff interview or in connection with any investigation."
Nothing more - no description of the underlying charges, no clarification of the severity of the underlying charges. Just a simple failure to appear. The decision from the Business Conduct Committee was a premanent ban from all designated contract markets, swap execution facilities, or derivatives clearing organization owned or controlled by the CME. A simple denial of access to CME liquidity forever.
The ICE US notice was more detailed and is here. This notice laid out three rules violations associated with spoofing, one related to conduct detrimental to the exchange, and two related to failing to respond to charges and appear at a hearing on the charges. The ICE notice iconcluded with the same permanent ban on access to all ICE US Futures trading facilities.
It should be noted that the CME and ICE US Futures processes have slight differences. Under the CME process, failure to respond to an investigatory request waives the right of the subject of the investigation to a hearing on the charges and is seen as an admission of guilt from failure to respond. Under the ICE US Futures process, the failure to respond is an admission of guilt; however, the Respondent (the term ICE US Futures used for the individual or firm charged with the violation) has a right to request a hearing on the penalty. Failure to rrequest a hearing is deemed as acceptance of the penalty. CME does not reflect this second step in its notices.
Once again, Both exchanges in the same week have reaffirmed the simple truth - signing a brokerage agreeemnt to trade on US futures exchanges is an acceptance of jurisdiction regardless of whether you are located in the US. Failure to accept that is an admission you don't want to trade those markets. If access to the liquidity of US markets is important, than compliance with their rules is a simple necessity.