I think part of the problem is that a lot of these lotteries make you lose your anonymity. This leads to leaches, whether friends or family or strangers intruding on your life. I’ve often thought if I came into money, I would keep the news to myself as much as possible.
One piece of advice I heard in regard to anonymity, is to change your name just before you claim. Don’t sign your ticket until you are ready to claim your prize. My lottery corporation allows you to wear a disguise, once your identity is confirmed. So you could change your name and wear something simple like a hair colour change and a hat and false glasses.
I read a book about millionaires "The Millionaire Next Door." The book detailed how there are many people who are millionaires but who don't live ostentatious lives. In short, they look like regular people, but are loaded. That's probably the way to go.