Apparently they agreed to go public because it would be difficult to hide the fact that they were the winners. I have thought about that before. I mean, what if it had been me and I didn't want anyone knowing....I'd be letting the cat out of the bag to buy a new house/car or spend any significant amount of money.
Mind you, I think I'd have remained anonymous and let people guess, and I'd laugh and deny it if I was asked.