Because Cyclone and Bobba.io was never truly finished;
to continue advancing them would require "advanced" programmer knowledge (not necessarily experience, but understandings at the very least).
Also you're looking for the term client, not server.
Hotels are migrating over to Nitro since its release. I wish the scene was more interested in a HTML5 sandbox, where we now have the easiest control we've ever had to modifying our Retros to do all those things everyone fantasized about implementing but reaching out for help getting started here has always been a scary thing. Habbo Retro (primarily server) development has been gatekeeped so much.