Kalopani,

Here are the few differences i have observed.

The direct authoritarian rules makes it impossible for commoners to excercise frauds. Only people who could exercise fraud is the ones closer to the direct rulers only.

There was not enough wealth for everyone to excercise corruption about...i remember in the 90s somehere Nepal's budget used to be 30 Karod...now we are around 3 Arab i think.

Lack of information, lack of democratic due process ( in an authoritian rule it is much easier to accuse and punish someone for any cause), and higher social values ( fear of being know as a ghuskhor)

Smaller population and the world in overall was more moral than what it is now. Its just not Nepal's problem...the whole world is seeing more fraud and corruption including the first world i think.