And plus, people would just make a bunch of inappropriate animations and in the end, we would have hardly any decent ones. If people came to this site just to watch the videos, it would surely make it more popular, but then everyone would just forget about the games.
Remember, you can also post links to videos on your profile, just as long as they aren't inappropriate.
But isn't that what Newgrounds is for? They basically have everything, inappropriate or not. Their way of blocking their programs aren't very durable either. I don't know about you, but amateur inappropriate videos of flash are just horrible.
