This is a poor analogy. Most of the infected computers that the FBI accessed aren’t even located in the US. The FBI has no jurisdiction in those countries.
https://www.justice.gov/d9/2023-08/23mj4244_warrant_redacted...
impossible is the wrong word here, its just unnecessary. The Feds can (and do) definitely contact domestic & international ISPs to perform near 100% accurate lookups.