I know Jeff Bezos is considered the richest known person but there is a lot of hidden wealth in the world.
I've heard the following people may actually be trillionaires:
Putin
Oil Saudis
Rothschild family
We will not know who is the richest man in the world because we have hidden organizations that we cannot see or reach.
Drug dealers and arms dealers are very rich and they do not have to pay for taxes. in mafia boss movies we can see that and they are even so powerful that they can manipulate the police.