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3) My main goal is to get these scams out of the Marketplace > lending category - it makes us look foolish and stupid to anyone new exploring BTC
I think, trying to relabel the Lending category is currently hopeless. There are too many people around who want to believe that those are genuine businesses.
I also think you are overestimating the damage these scams are actually doing. Even pirateat40 is estimated at only $1m, which is a small fraction of the total bitcoin value.
On the positive side bitcoin users are learning fast. We have seen a price bubble already, which developed at over 100 times the speed of a similar bubble on the exchanges in 1929. People have learned the lesson, and a bubble as extreme as that may not repeat itself.
Now people are going to learn about Ponzi schemes. After the first few shut down, people will learn that lesson as well.
Another good thing is that each of these experiences cleans the bitcoin community of its stupidest members. To hand your money over to somebody you don't know, but who promises you 3,300% interest per year without explaining how he does it, and all that in the face of very explicit warnings, you have to be enormously stupid. If you don't want such people around, just let the thing run its course.
I agree that most likely all of these schemes stating weekly interest rates are scams. Those who already proposed to include the entire Lending category in your list are probably right.