I like the idea of clients being free to publish anything... but what will you do if they misrepresent what you said, and claim they got the information from you? If could be a honest mistake (omiting part of information that did not seem important to them, but which in fact changes the results critically), oversimplification for sake of popularity ("5 things you should do if you have cancer" for a popular blog), or outright fraud or mental illness. For example someone could use your services and in addition try some homeopatic treatment, and at the end they would publish your advice edited to include the recommendation for homeopathy.

So there should be a rule like: "either publish everything verbatim... or don't mention our name". (I guess you probably already have it, but I say this for the case you don't.)