It'd be quite easy to DoS commercial build services with this technique and there seems to be no way to stop it and detecting it can be pretty difficult. Depending on how the logging for such a server is structured, it may even be hard to tell which customer did it.
This is also on the heels of a bug that's been discovered where it's possible to hang many types of system monitoring by abusing a race condition in the UNIX<->mach layer to block all process inspection tools on the OS.
Given that Apple forces us to run OSX build servers, they should take the integrity of basic syscall checking seriously. And that totally ignores the chaos one person with an agenda (or poor project security) can cause if they get code that does this into Homebrew.