At this size, some obfuscation might be good. If you find a bug and crash some browser, it's not a big deal. If you find some problem in LSE that can be triggered from outside, you're dealing with realworld $M transactions.
Also, unless you have a huge farm of servers it would be useless to you - and basically anyone really.
> What if all these systems were open sourced?
LSE considers its software to be a competitive advantage.