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And this is why you need strong/clear HR policies.

Sure, at their size now. Not before, as policy beyond "use good judgement" at a small company is basically pointless.

Your first dozen hires must all be good enough to write such policies...

FWIW, Github hasn't been a "small company" for quite some time. github.com/about/team says they are currently at 237 employees.

"Don't give non-employees admin privileges on your system" doesn't really sound like an HR policy. It would have been a good policy, though.