Competition would be my first guess. Or an active employee somewhere that doesn't want to use github: "See, it's offline, we should roll out our own solution/ke

Competition would be my first guess. Or an active employee somewhere that doesn't want to use github: "See, it's offline, we should roll out our own solution/keep using what we have". Or just testing out botnet on an appropriately sized target. Or anything else really. There are dozens of valid reasons.