I actually know a couple of people that have won big on it so I know it isn't a scam lol. And when I say big I mean between 2-5 million not the euro jackpot, but still a large amount to win.
It's just a bit of fun
Speaking of tax tho, all lotto winnings are tax free so if you were to win 200 mill you get the lot unlike other countries that take up to half.