It certainly could be done, but I would not call it "very very simple". I know I'm not going to share info with someone who joined last week or last month. It's going to require a time commitment for someone to convincingly pass themselves off as a "trusted member". They're going to have to write convincing PM's and believable reviews with some sort of information that makes it sound like they really were at such-and-such AMP. At a minimum, it's going to take a good number of hours and more than a few days of work.
Again, I'm not saying it's impossible or even terribly difficult. But compare that to LE just signing in and getting all the info from some lamebrain review that spells out everything. Anything I can do to make it harder for LE to act, I'm in favor of.