Does this doubt come from those who have not yet won? I do understand how people feel about this. Indeed, that problem exists, but for a system full of greed, they can still operate without any hesitation. But I also know people who win a lot of money, and not everyone wants to hide their identity. But in some local cases that I know of, they are all low-income people and luckily, it came to them, the amount of money was too large to help them change their lives (usually worth over $5 million). So I don't want to equate all cases, because no matter what countries there are, there will be good/bad people, so whoever wants to doubt should continue to doubt. Whoever wants to trust should continue to believe.
No, I think everyone has doubts that's why it was raised, and with the social media age, it will definitely get a audience that now the Philippine Senate is involved already and trying to uncover if there is really some "magic" behind curtains and as to who is the real winner from their lottery because the picture itself is obviously doctored and photoshopped.
So two things came into my mind:
1. the result was rigged and they might just pick random people to win, but it's all just front for them
2. there is a real winner, but the way they hide the faces looks very suspicious