One thing I really like about the gallery is how easy it is to bypass creations using CC. So if you don't like things made with CC, you just leave the tag unchecked. :)
I don't use CC like I used to, but even when I did, I never browsed the gallery with that tag checked, because I didn't feel like having to track down everything and add it to my game manually. Even still, I preferred it that way, regardless; say the gallery glitched (it's done this in the past) and didn't filter something with CC out. If it transferred CC, you'd then have it in your game, and I definitely wouldn't care for that.
