A litmus test for centralized currencies is to ask the question "can they create wealth out of the thin air by manipulating a database entry?" The answer is affirmative for ChangeTip. To their credit, they maintain proof-of-reserves online, so while we do not know the amounts held by their users, we have an idea of how much they can pay out. I applaud the transparency they have shown.
I won't respond to the drive-by ad hominem.