creative world gives and fines money, if it doesn't give, at least it can fine, I confirmed that by slaying a random villager next to my creative land, i was fined 150$.... i didn't check money before at first, so I went to another world, checked my money, got back to the creative, killed another villagers(those are like pests in my build zone, there's not even a village) and then got back and I confirmed that I was fined.

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as you can see in the picture, and can assume due to the fact /money doesn't work in the creative world, you can see that I was really fined, and it was not in the place I used /money, but in the creative mode.