I'm not sure I'm following you. You are apparently referring to lines 1124 - 1130 in the 2002 edition:
"The appraisal review requirements in this standard do not apply to:
The activity of review or audit in the context of other professions, such as accounting;
An appraiser's study of work prepared by other types of experts, such as engineers or other consultants, or to work prepared by an appraisal consulting assignment under SR 4 and 5;
and review of an appraiser's work by non-appraisers, such as in an adminitrative review."
So in the first case, our definition of "review" is not the same as may be used by other professions, such as accounting. We have our own definition.
In the second case, "appraisal review" is not the same thing in USPAP as "reviewed the engineeer's report' or "reviewed the title report". In other words, SR-3 doesn't apply to non-appraisal work, not even another appraiser's consulting work as defined in SR 4/5.
In the last case, SR-3 does not apply to administrative reviews. As professional appraisers, we would seldom have occasion to do an administrative review unless we were engaged in some kind of non-appraisal activity. An example of this would be if I had both an appraisal license and was a mortgage broker, and was reviewing an appraisal for one of my loan packages to decide which program to fit it into. That would be an administrative review because I'm a user, not a reviewer. Or if I were purchasing a complex property type that I am not familiar with and I wanted to know what the pros think. Again, it's an administrative review because I'm a user, not a reviewer.
To ask a related question, let's say a client or a relative shoves someone else's appraisal report in front of an appraiser and asks for their opinion. The appraiser takes one look at it, spots some obvious 'flaws' and comments "This is crap, burn it". I would say that that appraiser just made a review, the only question being did they go through all the steps necessary to develop a credible opinion (3-1) and express that opinion the way its supposed to be communicated (3-2 and 3-3).
This scenario is related to the appraiser who is asked to express an opinion of value over the phone on a property they have never actually seen. They are still responsible for that opinion of value and the report, even if there is no contract for services.
The implication I got from your post was that if your client provides you with a copy of someone else's appraisal report, you are somehow spying or otherwise violating the Confidentiality section of the Ethics Rule in USPAP by looking at it and developing and communicating a review on it. I would disagree with that line of thought because the client is allowed to give you the report (its their's to do with as they will), you are not violating Confidentiality in speaking or reporting anything to your client, and you have no obligation for confidentiality with respect to the original appraiser. Handing the report to the approriate regulatory agency shouldn't be a problem either, as long as it came into your hands legitimately. That said, I'd get the client's permission before I sent it up.
Whether we like it or not, our work gets compared to the work of others, particularly in the case of 'duelling appraisals" on the same property. We need to have the means to defend ourselves and the public against the bad actors within our ranks.
On the other hand, I may have just misinterpreted your original post and went off the deep end. If that's the case, let me apologize up front.