Is it improper? It obviously creates room for impropriety, but I personally find it very obvious that organizations responsible and equipped for e.g. finding CSAM or for mitigating foreign influence campaigns (yes, real things!) or for reducing the spread of ISIS recruitment material should have their reports sit above those of newuser1737382847.
You’d really suggest that all reports must be treated equally?
This is an extension of the whole “Three Felonies a Day” idea: it’s likely any prolific account will violate Twitter Terms of Service at some point, so you can target almost anyone by looking hard enough.
And Twitter is likely to look harder at reports from the FBI than your average user, therefore the FBI has more influence over who they can silence. Maybe they’re abusing it, maybe they’re not, either way it feels improper at best.