I don't think anything I said was related to legality, but I apologize if I wasn't clear about that. Agreements between people are definitely enforced by legal means, but agreements between people are also a moral question about honesty -- will you do what you said you'd do?

But what I hear you saying is that society should not allow people to enter into agreements that would be conditional on what they use that service for, is that right?

If so, I strongly disagree.

I should be allowed to enter into agreements based on how I behave, and I expect people I enter into agreements with to abide by what they claimed they'd do, including if they agreed ahead of time that it was up to me to evaluate their behavior and judge for myself when to stop allowing them access to my service.

To deny me this right would be a violation of the concept of ownership, which I believe is a critical aspect of modern society.

This is a different discussion if you don't think people can own things (which is a fair argument, though I would have disagreements as well).