Outside of the fact that most EULAs are not binding and have never been enforced in any way, there is also the fact that it is the sellers responsibility to make the EULA available to the buying, and if that is not done, then the seller would be at fault and you would never even end up in court (if that would ever happen in the first place).
Even if, in some strange alternate universe where people have time for this crap, it did end up going to court, STEAM would be the entity that would have to deal with the problem, and.....at worst, would have to remove the game from it's stores, and remove it from all players accounts (and obviously give them a refund for it at that point).
You, as the customer, would NEVER be in trouble or have to deal with the issue. So enjoy the game and stop worrying about it.