A representative from Italy might ask for one specific element of information, another one from Germany might look for associative information (who a person is and who they were with) and one from the UK might ask for things as precise as the hour and minute at which a particular action would occur (this is due to the high amount of cameras that cover London for example, which could then be used to match movement around a region with surveillance to the data I would provide).
I would say most of the requests were reasonable from my point of view given the background they would provide - I guess it's also down to the person requesting the information. But as time progressed they figured out that I was able to get information or that we had information on a wide variety of elements... As I said initially, it goes from "Find info on John Doe, with an email account jdoe@email.com, with a date of birth of 33/33/2033 who did this activity at 11:30 PM on 01/01/2053" to "We have this email which is either jdoe@email or jdoe@gmail but we're not sure. Can you check all such occurences?".
I think the point is also that Europe isn't THAT much better and while people might wave privacy laws and GDPR as proof of Europe's "superiority", I think a lot of those things look good on the surface, but they still don't protect you as much as you'd think.