They don't specifically want someone to hack it, because all the component designators are missing. I don't know why, because there is plenty of space for them. The debug people would be peeved. Speaking of which the board lacks test points. Clearly they don't do ICT and probably do minimal testing.
The track layout seems really good, with length tuning and differential pair impedance control.
Their pin 1 markers are inconsistent. Some are missing from IC's. I almost always use triangles as pin 1 markers. Much better than round dots for a number of reasons: Readability, prevent ambiguity, distinguishes from fly vomit and test points and vias.