That would be implying the protoss were inspired by predators and the zerg by starship troopers (which is humorous to me). Take a legit look at a predator and at a protoss... I see where people are coming from but hot damn... that is a very far connection.
Look at the independence day aliens. They have protoss-like features. Did blizzard rip them off to?
In my opinion, when you have things from the same genre, you are always going to be able to make some kind of connection to it...
Avatar and Pocahontas
The Empire and the Nazis
Did the Halo elites rip off the predator? They were alien... they could cloak.. they had mandibles... they were tall as hell. No doubt an insipration but not a rip off lol
You can pick out similarities but I don't think they ripped off the predator with the design of the protoss race. They still don't even look alike to me aside the dread-style hair... and if you play that card... where do you think the predator got his design for dreads?
I whipped up a photo for people who never played Starcraft... even after making this, its even crazier to think that Blizzard straight up "ripped off" the predator franchise... The protoss unit in this pic is a zealot... the closest thing that even resembles the predator... Maybe a dark templar perhaps... like Zeratual... but check it out