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You can warn people without promoting it. Once you start promoting it (or standing by and watching while it happens) you are then liable for what happens after that.
I am no more "liable" for the misuse of the trust i sell than a gun shop owner is "liable" for the murders comitted with the handguns he sells.
I wish to learn if my business runs afoul of any extant forum rules, not to start a debate about my responsibility for some hypothetical wrongdoings of others.