So does humans with copyright and capitalism, even more so, with more competition and incentive to make money or get fame. Let's say without Copyright 10 people do art for fun, take ages and quality does not matter. Its all fun yes, maybe 1 of them is talented. Add Copyright and incentive to earn money, suddenly you have 100 competing for money, try to make the best it can and earn it.

Copyright is not all about making money either. Without it, someone could "steal" your open programming code and then do modifications and sell it for anyone who desperately needs it. In example to hospitals. And because there is no rights and licenses to "own", the GPL can't be in effect and protect the Open Source of it.