When you sign up to use Facebook and click 'I agree' you are making a promise not to block their ads. It seems to me that to break that promise because the ads

When you sign up to use Facebook and click 'I agree' you are making a promise not to block their ads. It seems to me that to break that promise because the ads are annoying is morally wrong, but many people don't see it that way. I sell software as a service. If a customer doesn't like some aspect of my software I expect him to cancel his subscription. If he continues to use my software without paying for it he is breaking his promise to me, and most people would see it as wrong. What's the difference?