I agree that water4gas is a trademark, and it's normal that the owner of the brand asked Google to block that keyword for PPC, but it's kinda stupid to suspend "run your car with water", "run car on water", these types of keywords as well. Really, really dumb.
I making money from water4gas from organic traffic and have sold alot more sine google kicked those ads off "Yipee" more profits for me!! I'm ranking really well for some keywords too!! Sold 2 today 6 yesterday