Earlier quoted context omitted.
Because most don't want to work on something big, with a high risk of being sued into oblivion once released?
It's a pretty low risk if you don't put your identity out there. I know there's at least one Git forge that's a Tor onion service. Even on GitHub 99% of the time this ends with a DMCA takedown of the repository. You should probably put it on a pseudonymous alt account but you don't actually need to use a Tor onion service. You could also get someone else to put their name on the web hosting and so on. Don't know who…
I would say for most people his means they won't start the work if they don't know whether there is a way. Also most people like to get credit for their work. So the number of people capable AND willing to work without getting credit is low. And that is not surprising to me.
It is not my skill set, but I certainly would not invest much into something like this.