I assume he's referring to the guaranteed boost rates which range from 1.1 to 2x the fare.

So a passenger could pay $30 for a $60 ride. It's not practical since you'd be losing the increased rates and still having to drive, netting like $10/hour.

There are GPS hacks that can supposedly spoof your rides though.

A guy has 2 phones with different Uber accounts: driver, and passenger. He hails himself, and immediately picks up a hail from himself from his driver account.

At some times, the rate for a ride is less than the driver payout as Uber subsidises rides from time to time.

Another schemes are when people exploit "first ride free" and referral bonuses.

All of this refers to rather casual cheating, done by non-technically literate people to offset the cost of their own driving or supplementing their normal income from Ubering.

People who do Uber frauding professionally are in the different league. These are the guys whom engx is referring.