Apparently this doesn't prevent them publishing things in the Code Vault, or via this; that I might have wished to remove from their custody.
User agreements that amount to "you agree to be used," I guess.
If whatever stalker that I offended becomes unhappy that they might not have gotten my code off the net completely, are they gonna blame GitHub for it, or continue to try getting others to take actions against me? If some court sided with them and decided I had liability for publishing that code; would GitHub's possible resurrection of it be their responsibility, or mine?
EDIT: previously stated "after they offered me the option to do that or adopt a Code of Conduct on a single contributor project of mine."
Perhaps I'm wrong about the source of that; but I did delete my account and expected that they would no longer publish my code as such; others had forked things and that was as expected.