>It's not a contract to which I've agreed though. If they want me to get content in exchange for something, then they should make sure I do, otherwise, they are putting things on an open server that I can easily read from. What I tell my browser to take from it is up to me,
You are conflating the practical ability to do something with the moral right to do something.
The fact that something cannot be enforced is a practical problem, not a moral one. A rural car-park owner may have no practical method to force people using his car park to leave money in an honesty box [1]. His request for payment may have no legal standing. Neither of these points has any influence on the moral value of not leaving the requested payment.