In the Dutch postcode lottery, they draw a random postcode (roughly a street) and everyone that lives there and has a ticket wins. The wider area code (village level) win smaller prizes.
People get FOMO - what if my neighbors become millionaires but I didn't have a ticket?
And in this case, some code very close to theirs won. It makes it seem you missed out by a tiny margin.
Seems a clever marketing tactic to rope in more people.
How do you confirm address? ‘I moved home to my parents last week’ etc.
You have to buy a ticket - presumably you have to commit to an address somehow at that point, so people can only buy for one postcode even if they're lying. Unless there's a skewed outcome that shouldn't really matter. (And if there is a skewed outcome...the people who'd bought the winning postcode and didn't have a house on that street would be under heavy scrutiny!)
Apparently, at least in NL, you can buy for different postcodes even though most do not.