What's the meaning of Hazard Level?

17TRACK will grade the bad buyers according to several dimensions: numbers of reported times, time, platforms, etc. The details are as follows:

Level One: Suspicious buyer. The transaction might be at risk. 
Level Two: The buyer is reported repeatedly. The transaction is risky.
Level Three: Dangerous Buyer. Please be cautious or cancel the transaction.
Level Four: Bad buyer. Please stay away to ensure the safety of your transaction.
Level Five: Extremely bad buyer. Please do not trust the buyer easily.