DM is privately held and as a result, their numbers are unknown, unlike EDIG's.
What better way to expose your competitor to help you better compete in that space?
Also, I cannot think of a legal win to boost morale than doing to digecor what they have been trying to do to EDIG.
Suing digecor does not have any bearing on any other suits DM may feel they want to bring.
Is digecor a big fish? No. Could it yield revenue to EDIG should DM win or settle? Yes.