[abigail95]

Even with a user agreement I think they need to gate their service behind that agreement, otherwise the agreement is optional and open ports are open for use.

You still need to form a valid contract - no notice, no assent, no contract.

If there's a gate that's being bypassed then this all changes but it doesn't seem like there is - and it doesn't seem like they can add one without breaking existing printers.

[kayson]

In this case, you're signing up for an account and entering into the user agreement to do so. There's a whole separate legal discussion to be had about the whole "scroll past it all and just click accept to make it to away" thing...