I remember various people from that time pronouncing warez in two distinct ways. wares ware-ez I'm not sure which is the correct way.
My interpretation was/is that they're both right. The word originated as 'wares with a Z' but once it was spelled that way it became natural to pronounce it 'ware-ez' but nobody thought you were unintentionally mispronouncing it. The in-joke continued on certain boards as 'warez' became 'Juárez'...
Warez as "softwares" seems reasonable to me, but language moves.