>>81612450Because the KS project was pretty transparent overall. There were a lot of problems, some people left, a handful of new blood joined and the overall quality of the game would have been much lower if it wasn't for some big(at the time) talent who offered their help for free purely because they caught wind of the project, saw how far it was coming along and thought it was cool that it happened. There's a reason why most of them abandoned the group the moment the game released.
There have been a few attempts at big 4chan projects since then but nothing came anywhere close to what was accomplished with Katawa Shoujo, likely because the novelty of a 4chan project was gone after KS happened. That's how things tend to go in general. Just look at how big Twitch Plays Pokemon was and how a vast majority of interest in that medium as a whole took a nosedive as soon as it was completed.