Who cares for which game was the original mod released?. If anyone has any right to this trademark, is the original creator of DotA (not frogboy, and not Valve, and certainly not Blizzard).
Also, as an ex-fan of Blizzard, FUCK BLIZZARD. They can shove their "we are doing this for our legions of fans" up their us. If there is any room between the $100 bills, that is.