The Mona Lisa is a terrible example - it's not ok to steal it, but it is perfectly ok to copy it.No, it doesn't become gray at all. There's only one Mona Lisa, so it's ok if we steal it because it's impossible to purchase! It doesn't matter if it's hard to find, if they haven't very explicitly made it publicly available then you're breaking the law.
Legalities aside I am 99% sure that you wouln't be all that impressed with any abandoneware version of Strike Commander. That little beast DOES have a copy protection (unlike any DOS WC games).