Please show me in the board rules where that is prohibited.
To the best of my knowledge it's not explicitly spelled out anywhere for public consumption, I could look into this further if you'd like, or ask Petra to put it clearly in the rules, though really, it's something that shouldn't have to be stated. The rules can't possibly cover every single potentially stupid thing that someone could do, at a certain point you have to rely on common sense. Ultimately FreeOnes is a business, and they have to work with the people in the industry. Allowing end users to violate the privacy of those you work with is obviously bad for business. Common sense should tell anyone this.
If it helps, it is confirmed as an infraction for moderators, and I've already received word from On High to permanently ban an unrelated user for offenses in this vein. So I can assure you it is against the rules.
Beyond which...
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...there's a nice catchall that covers it, and I gave fair warning.