It's a different model of development. One that doesn't invite collaboration outside full timers, or "committers".

SVN is CVS done right, but since the model is inherently ineffective for open development, you can't simply fix it.

They appear to be doing some NIH with "got" (https://gameoftrees.org/) but it's so aggressively uninviting (see the FAQ) that I don't want to spend any time looking at it, if they don't want me.