~
Laszlo still has a lot of BTC, I don't think he is the biggest loser. His transaction actually made it a very historical act in BTC that every year there is BTC pizza day to celebrate it. There are users who had lost it all like the ones who lost his hard drive to which thousands of BTC were there inside because that drive was used to store the mined BTC.
I am not trying to say that Laszlo was the biggest crypto loser but in the context of the thread,I am saying that Laszlo lost more bitcoin than OP. Those people with the lost drives weren't the biggest loser since they contributed to the growth of the market with their lost coins.