HOW DOES GRABCAR MAKE MONEY WHEN IT BLEEDS MONEY WITH ITS INCENTIVES?

I have a friend drive grab recently, he started at January….he show me his account by hand phone…a day he drive about 10-11 hours, came out 7am drive to 2pm stop… and 5pm drive to 8pm or 9pm…. daily income about $200-250… before rental n oils… n 20% company take… so, a day he earn about $80-120.

But…his incentive was $800 a week…so taken money plus incentives was $2800 plus $3200…. total was $6000..

I m thinking, if he drive $230 a days, Grab just taken him $46 a days…but his weekly incentive r $800… means, Grab r given him incentives $120 a days…it means grab r losing $74 a days…how Grab earn moneys?