DOJ could cut Z.ai off from US-based payment systems (Mastercard/Visa) if they don't comply with subpoenas.
It’s also hard because no individual case would likely justify a move like that. It would have to be the sum of many, many cases.
Run a sanitized VDI with no local storage --> offshore independent entity (e.g. a Hong Kong Company) that holds the AI service contract and API license --> GLM-Legal.
Somebody ought to set this up for pro se work.