Nobody is fooled.

If you had reason to suspect an unfriendly reception, then you should have avoided the USA entirely.

The use case is discouraging low-effort/low-priority digging for information. Asking to see your feeds costs them zero. Digging in deeper or detaining you would consume actual time & effort.

If I'm ever asked to do this I physically can't nor would I subject myself to that search. I don't know the password, I don't travel with my yubikey, and my mobile devices don't have 1password installed. So there is no getting into my accounts.