The holding company of the foreign entity is in the US and can thus file for ch11. See who owns FTX Trading Ltd (Antigua) for example: https://d1e00ek4ebabms.cloudfront.net/production/8566b562-d5...
The US has Chapter 11 bankruptcy, while Antigua and Barbuda might only have something more closer to the US's Chapter 7.
FTX Trading Ltd is "is incorporated in Antigua and Barbuda, and headquartered in The Bahamas", yet the linked statement clearly says FTX Trading Ltd (plus the FTX US entity, and Alameda, and others) are filing for Chapter 11 under US law in Delaware.
Is there a parent company of FTX Trading Ltd that's based in the US?
Edit: Apparently "Paper Bird Inc" is registered in Delaware, is 100% owned by SBF, and has ~89% ownership of FTX Trading Ltd.