Well according to the news in this ARTICLE¹, that the picture was intentionally edited poorly in order to conceal the identity of the winner. Additionally, parts of the edited picture was taken from random images across the internet (google images) in order to really cast doubts as to his/her identity.

Personally, I find it amusing that people are even talking about this. If I were the winner, I would definitely prefer my face to be poorly edited (like the one happened currently) in order to fully conceal my identity. Be reminded that even the clothes you wear and the color of your skin may be identifiable by your friends/relatives if they were posted and unedited.

Lastly, this is all for personal safety and security. There have been rumors about the genuineness and legitimacy of PCSO announcing winners with strange patterns in the past. While this may be reserved for another discussion, I fully believe that the person that won here is true and real.