sad but people are lazy and it's easier to steal than to earn, think of risk:reward ratio. It's hard to jail him, it's hard to prove he's a scamy slime, plus earning that 500 steem will take a while.

It's free lunch if you get it, usually they just cash out, the sad part is they are usually screwing over the smaller accounts, basically destroying the work that went into it, imagine it like this, you make 500 steem, some guy just takes it, the blame is on you and you have nothing to show for what you were doing ... he's happy he got his free lunch and goes about his day, scamming more people.

Sometimes the story is different, more complex, but that's rare.