I have no idea why they leave SMW Kaizo Hacking community. It's possible they're getting bored, because Super Mario Maker and Undertale are out. I started my adventure with kaizos making Super Mega Difficult hack
(I made it in 2013, that's why it's bad). Now I'm working on Monstrous Mario World and this hack has way better challenges. I'm still interested in SMW hacking and I won't leave it too early, because it's creative and interesting at once.
I have a Discord server as well!