Because they think this is the best way to make money, they think they can use words and earn a lot of money without putting their labor to create it.
Well, not really everybody. I believe some of them that are doing this their conscience is always judging them, but they have no other option especially when theyre in a country where the government and economy is pretty bad. Well, that doesnt make them any difference, no matter the reason, people should learn not to put their hand into evil businesses. But most of the times, I blame government for not being able to provide job opportunities for their people, thats extremely evil.