If you don't like to watch episodes before, then wait for months until episodes air in USA. The Incredible Shrinking Sponge production has been finished a long time ago, but it still hasn't been released in USA and that makes no sense. Thank to Russia which aired this episode with English audio and to Iberia which brought us even better quality.
I honestly don't like to see how, after months of waiting, Nick USA shows us a promo with some interesting moment of an episode, so that the audience is amazed and said: "OMG, I can't wait to see what happens in the episode". But maybe no one is already interested in this episode.
So yeah I like to see new episodes airing on different international Nickelodeons prior to USA broadcast. Besides, Nick Iberia has English audio tracks what makes possible to watch the episode in original. No matters what episode and where, if other countries want to release it before, let they do. It's not their problem that episodes air earlier, but the problem of the US, that episodes air later. And in my opinion that's not even a "leak". It's not an illegal stealing of the episode or hacking Nickelodeon or I don't know... something else. Nickelodeon broadcasts it, just in other countries. Because one is surprised if an episode airs, for example, in Israel after the US. The same thing. They simply air according to their independent TV schedule, that plays into our hands.