This is obviously edited photo as winner probably wanted to stay hidden. I personally understand it well, its not possible to win and be recognized in my opinion. People around you would directly start asking for money. I suppose its best to stay hidden. Also I don't think its a proof to corruption. Officers working for lottery wouldn't want to be involved in such situations because huge money is involved with lottery. Risky for their lives.
Not posting the picture is better than editing photos that would only make the agency suspicious. Philippines is tagged as one of the most corrupt countries in the world, so people would easily thought that there's something wrong with this, and that people inside have pocketed millions of winning already. I think this was already called in the senate, and investigation is happening now. Hopefully they'll dig deeper, like a lifestyle check of the employees especially the officers of the agency so they will be caught if they are doing something illegal.
We understand that they are protecting the identity of the winners that's why they should do some counter measure so they can assure the safety of the winner. But for doing those things like presenting a edited picture of the winners it creates a huge trouble to them since many are convince that they are just manipulated the result and the money is been corrupted by those officials. In this case where there answer regarding on the issue is not convincing I would advice to my friends there in Philippines not to gamble on their national lottery since I believe the system is rigged and they can't get any return since it will always in favor with those officials.
Glad there's a Senator rise up the issue and now they are tackling this topic and hopefully Filipinos can get a proper resolution regarding on this case then they can show to people that they can still trust the lottery system in Philippines.