Ephialtes gave up on RTB and blockland because he realized that making a large scale mod for a community of 7 year olds is a poor idea. I'm actually quite happy that he discovered that there is more to life than devoting your adulthood to perform charity for a kid's game.
Many people are trying and failing to bring it back, simply because they think blockland is nothing without RTB. In truth, RTB is pretty much obsolete, considering Blockland works with a steam overlay. The only thing RTB has that steam doesn't is the IRC, which is just a huge loving mess during daytime hours.