A lot of fundamentals to fully understand any problems are not covered here. It can be the article is right or wrong but it's nevertheless inflammatory. Just to prove my point: Look at the P2P micro credit market (which works in the similar direction and out of the scope of fed regulated money market) where it is no big problem to get 12% APY on established P2P institutions.
Due to the nature of p2p lending sites the sites often have incentive to make it look good for the investor, as for them any activity on the platform brings fees in.
I think it is pretty logical that if some place makes consistent 12% to have that lowered along the years as investors will find the good places quite quickly and start competing for the price.