Extortion, research, or for evil. Attacking Github may be an attempt to effect someone that uses it (Github may not be the direct target). What if it's possible to effect HFT trading.

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We do know that they've been consistently attacked. Github has been unsuccessful in mitigating attacks.

Github needs to explain why these attacks are happening. What is being done to stop them. What has been done to stop them. And if they are different from previous attacks.