People will always find a way around the restrictions. Just like they do now with names.
As far as manually reviewing content goes, that could take up a huge amount of time when developers should be working on the game rather than keeping offensive content out. We'd need a separate team to do nothing but handle offensive content. I'm not saying that's impossible, but I don't see it happening. Regardless, we would love to see more custom content in game. Hopefully, we can find a good way to make that happen.