I'd say this is far from useless. Especially when building your own engine, you can look at other implementations and reuse elements that you need. The company

I'd say this is far from useless. Especially when building your own engine, you can look at other implementations and reuse elements that you need. The company I work for specializes in video game ports. Getting only the source code, without documentation, or a back-channel to ask questions on a regular basis is standard for us. Still, we manage to get by just fine. I am thankful for every piece of code that is opened up, especially when it's published under a permissive license. The devs likely don't have any intentions to build / support a community around this release, which is perfectly fine. No one is stopping you from building your project / community around it either. Think about it like Doom / Quake engines, they are pretty popular as well, but didn't come with a lot of documentation or support from id software.