They can stay anonymous for ninety days.
That is plenty of time to move and leave their old life behind.
If they stay close to “friends” and family they are doomed.
My advice would be to move somewhere where everyone around them has more money than they do.
See? They might have had a pretty good life - now they have to do this. Even if they were in bad straits, now they can’t trust anyone, since everyone will appear to be trying to play them for their money.
A lottery win is a curse.