I don't think this is a mistake of the sender. I think this is a test of Ethereum's fee that the team wants to perform. No one would transfer a few hundred dollars and accept such a large fee. Do not FUD when you are still not sure what is happening and what is the cause.
I like to hear the official announcement if the owner of the said address if this is intentional, or a grave error on his part, we can only speculate unless they or he comes out, I search here in this forum and it's not part of any bounty campaign, but this is one example that you need to double or triple when sending coins.
Like pizza day (the one involving bitcoin) now we will start celebrating transaction day in which a guy paid $2.6M twice as a transaction fee to transfer .5 and 350 ETH.