[shubb]

I understand that high frequency trading algorithms are often predatory, identifying other algorithms making trades, and exploiting their known behavior to trick them into making bad decisions.

Although it may not be the case here, one can imagine that this source would let you fingerprint the Goldman algorithms, and give you an idea of the way they make decisions. That might allow one of these automatic con man algorithms to steal a huge amount of money.

In this instance, the case is more likely that Goldman payed the programmer a million a year to deliver software that gave them a competitive advantage (of significantly more than they paid). By taking that software, he removes the competitive advantage they bought from him.

Let me ask a question:

Imagine you paid an online contractor to write you software. Maybe you paid them to make an Ap idea, or a website. Under what circumstances would you object to them putting the whole thing on a public github? What harm could it do you? That harm, amplified by the money involved, is Goldmans case.