What would you win? Cmake is capable of executing shell commands and you end up with a binary that will execute on your machine anyway. At the end of the day it is just a matter of trust anyway, isn't it? I personally use bwrap if I'm not confident about the source.
Cloning a repo and building it is not _that_ hard, but easy installation is often the thing that makes or breaks a product. I believe Ollama proves that point in this context.