But how would you even know if other clients were respecting it. I discovered purely by accident that some clients let you see who's zapping who, while most clients don't. In that scenario, how you you write a script for what you can't see. Unless you watched every client out there?

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But couldn't some clients be written to ignore the requests? I remember that happened with usenet. There was a client called News Post that was specifically written to ignore cancel requests. It was also written to ignore moderation requests. What would stop someone doing the equivalent?