A lot of people talking about governments as NSO's top clients... How do the governments actually pay them? Out of their pockets? State budget? In any ridiculou

A lot of people talking about governments as NSO's top clients... How do the governments actually pay them? Out of their pockets? State budget? In any ridiculous case, shouldn't this kind of payment be easy to track? Why is no one talking about this? Why isn't this forbidden on international level? The US (as world peacemaker) seem pretty chill about it. I thought this was 'merica!