The app is vibecoded. The author isn't making decisions about these tradeoffs and possibly wasn't aware of the implications of these decisions at all. The robot they used tried to fulfill its given prompts at the expense of everything else, which is why it's looking in bad directories and trying to install Docker environments in the build script.

I suspect that some of the author's comments in this thread are vibe-written, also. They are LLM-flavored and contrast strongly vs. their regular commenting.

It's not open source if it has to download binaries from the internet to run.