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Make a "Yes" and "No" tagselection. It works fine and you can use it as a filter.
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Or any other case in which a checklist of some sort would be useful... such as an adventure in which the number of tasks the players succeeded at determines some result.. a list in which the successes can be "ticked off" makes that easier to adjudicate.
Reveal is binary at the moment, but it is planned to become something else when it becomes per-character reveal. It will no longer be simply Revealed or Not Revealed (though we have no details on what it will look like). So even though it could be used as binary for now, it isn't going to stay that way.
Also from personal experience check boxes are expected to be multiple select while radio buttons are expected to be single. Both should be available.