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.