>>We actually ask websites to tell they're a part of this, but we cannot control what they do because they can simply display:none.
You could certainly just check to see they're using it properly. Do a screen scrape or even have someone hit the page every month or two, ban anyone abusing it by not notifying users.
You could certainly just check to see they're using it properly. Do a screen scrape or even have someone hit the page every month or two, ban anyone abusing it by not notifying users.