not giving a fuck is not a matter of how MUCH effort is put into something, but rather how much one CARES about whatever amount of effort they happen to have put into something.
man 1 can work hard all his life and make millions and literally be not giving a fuck
about what has happened in his life
man 2 can be homeless and mope and be sad about his position in life, therefore he fails in not giving a fuck
and in this senario he is the "loser"
As opposed to the common misconception that man 2 gives less of a fuck because he hasn't worked a day in his life.