I don't buy this at all. Changing the name is not hiding the fact that this is making money from a game invented by someone else.
Just like the guy who ripped off Sensible Soccer, sold his product and was surprised when Stuart Campbell ripped into him.
I'm sure it's a great game, but it's just using someone elses hard work and marketing (even if it was in the early 80's).
Free is one thing, selling it is a totally different ballpark.