First of all, no1 is forcing you to agree to this contract, you do this on your own free will if you dont agree do not play the game. Regarding the laws in Germany i do not know them but i know that an online agreement and a printed agreement is fully legal and also can hold up in any court of law.
Example being when you buy stuff with your Credit/Debit Card you agree online to that payment, now based on what you say any1 can request their money back after making online purchases and getting the goods in your country!
So please enough with your theory because it doesn't make sense.
As for the OP: "You will, NOT USE ANY AUTOMATED SYSTEMS, when playing Blizzard games." = banned with good reason (i am sorry though)