Why does Forbes pretend Carlos Slim is the richest man in the world and then Bill Gates?

Carlos Slim is worth about $52 billion. The Rothschild family owns several banks, one of which in London alone makes $100 bil/year. They also own hotels, oil companies and tons of other stuff and it's no secret they are one of many trillionaires in the world. Why does Forbes pretend their list of show-off small-timers are the real rich people?