I think suidperl has just proven to be an inherently bad idea that nobody wanted to work on it anymore.
It is surprisingly hard across platform to run a binary file with text input while making sure that the text input remains the same. As this is a security-sensitive topic and it usually requires deeper understanding for each operating system, suidperl was found to be too much of rope to give to people and take the blame for the security holes.
I'm not sure if the idea of "simply bad idea" transfers to the other projects, but I see quite much of CADT development, except that maybe not all of the people are teenagers.
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