Re: Its the people, not the computer
Some people are unscrupulous, and some people are gullible, and no amount of technology is going to change that.
It's not necessary to understand how to build a car in order to drive one, and I don't suppose anyone thinks mechanical engineering should be part of the driving test, so what happens? You take your car in for service and the garage tries it on by saying "your brake disks are under tolerance, you need new ones to be safe" which, if you have any sense, you politely decline. This happened to me a few years ago and I took the same car back to the same garage a year later and, for laughs, said "can you be sure to check out the brakes please?" and they came back and said "your brakes are fine, but we need to do [this other expensive work]". This was not a backstreet operation, it was a main dealer for a prestige brand, incidentally.
Perhaps what we need to do is stop wringing our hands about bad people using the Internet and just deal with it. You don't trust everyone you meet face-to-face, so don't trust people you "meet" on the Internet.