Maybe the Bitcoin XT developers did this to spread FUD about bitcoin's integrity?

There's been no updates about results even though the test is over, I think their attack was way less harmful than projected and they don't even wanna talk about it, 20 BTC was gone within a few hours since the transaction fees went up and they didn't properly account for that.

There's delays of a few hours sometimes even when the bitcoin network is totally normal, so this didn't prove much. If someone really hated Bitcoin and had a million dollars to blow it wouldn't last more than a day, so it's an unlikely threat.

In fact, I think this proved that Bitcoin naturally responds to such an attack/transaction volume increase naturally and eliminates the problem. Transaction fees simply go up so people stop sending spam/dust transactions and only important transactions. This suggests a blocksize increase isn't necessary.

Real scientists would be happy to have a result and discuss it rather than disappear. This was not done by scientists, the illusion that it was an experiment to better understand Bitcoin is false. Those behind this 'test' only wanted to make Bitcoin look like it needs XT to survive. I'm fairly certain this was a stunt by Gavin and his buddies. If my suspicion is right then we certainly cannot trust the Bitcoin XT devs, they are willing to destabilize the inner workings of Bitcoin and hurt the Bitcoin economy, in order to spread fear among Bitcoiners so that they can gain control of Bitcoin's code. Fortunately it backfired, I think they were willing to delay transactions for over a day and cause some real damage.

Who else would spend 20 Bitcoins on this and try to be completely anonymous? No one...