There is just a slight difference compared to Bitcoin. In Bitcoin you got less than 1000 people holding more than 50% of all bitcoins.... None of the assets above have such an unequal distribution of wealth.
Not sure if you are just spreading FUD or you just don't know any better. You have 1,000 addresses holding 50% of the currently mined Bitcoin. MtGox for example is one of those addresses and they had at least at one point 220,000 registered users. That is just one example.