I wondered about this too. The whole, "Stop stealing" thing, that is. Personally, I upload homes and sims I make. I'm by no means popular or anything. However, I feel pride when someone likes something I've made enough to download it to use in their own games. I upload things under the impression that that person is going to customize it to the needs of their sims. If they reupload that, I don't care too much. Some people don't build very easily, so using my build as a base is fine with me. If anything, I'm flattered they loved my work enough to improve upon it to use. That makes me happy.
Plus, it's a little hard to "steal" something that was giving freely to share around. But, that's just my silly little opinion.
