Generally they do - with some notable exceptions being if you're a non-citizen and you're no longer in the US, and it's either a criminal investigation or related to intelligence or national security.
> In September 2024, Amandla Thomas-Johnson was a Ph.D. candidate studying in the U.S. on a student visa when he briefly attended a pro-Palestinian protest.
> Weeks later, in Geneva, Switzerland
It is obviously not criminal, but I guess that you don't need much to qualify something as related to intelligence and national security, attending a pro-Palestinian protest may be enough.
The problem is they tell user that they'll inform you right away and give them a chance to challenge the subpoena.
A quick search shows that they've done in the past and people have been able to get the subpoena's withdrawn.
https://thefulcrum.us/rule-of-law/us-administrative-subpoena...