I guess that is one of the problems on world wide coops. First it takes time to notice. And if somebody vanishes from the surface it is not as easy as in old times when you worked nearby. You would just call or step by his/her door, ring and ask even relatives or friends what is up. Accident and in hospital, on a journey or just being at home sick from a severe cold. Or worse things. But if you just know people by an email adress ... that is not much. In my field I work with people daily on the same floor, but only from few I actually know where they live in my town (>500k inhabitants). One vanished for 3 months an I thought she'd be on a scientific exchange somewhere around the world (happends from time to time). But instead she was sick at home. :/
Stop TCPA, stupid software patents and corrupt politicians!