I am not a lawyer, but sounds like you don't have much to loose. It's your calculation to make, but you are probably in a position where calling them out publicly could bring you more benefits than harm (when that NDA expires, obviously), in term of visibility and respect.
The net for society of doing that is most likely positive as you are forcing them and others to reconsider their behaviors and warning other entrepreneurs of this behavior.
There is a risk they would try to sue your startup out of existence (ie. even if they don't have cause they can attempt to drown you in legal costs), but this would bring even greater attention to the matter.
The net for society of doing that is most likely positive as you are forcing them and others to reconsider their behaviors and warning other entrepreneurs of this behavior.
There is a risk they would try to sue your startup out of existence (ie. even if they don't have cause they can attempt to drown you in legal costs), but this would bring even greater attention to the matter.