IIRC, if you win, you have to make a public appearance when/if you win the whole thing.
You may be right, I thought that you could collect anonymously... Hope I have the chance to find out :)
The problem with the publicity is that now everyone know you have money and can come after you.... Someone remembers that you bumped into their car a few months ago and at the time it was no big deal, yet suddenly a neck injury begins to surface. Or someone comes over to your house and “accidentally” falls down. Etc. etc. It would just be so much better to collect the money privately and then disappear.
I think there are website with advice on what to do if you win the lottery.