The fact you have to buy 4 copies of the game to have it installed on 2 devices is not normal. Plenty of other games across all platforms allow you to login via any device that has the product installed. I have an active subscription for the game, so therefore i should be able to access it on any device that has the game installed.

This is clearly just a gimmick to make more money out of the physical copies.

edit- and to be clear it is against Terms of service ect to allow others to access your account (as in give them your password ect) this is standard in almost EVERY online environment
Where on earth did this come from? Not once i have mentioned about accessing other accounts.