No way even if it's a huge amount, I will take the money but I will question the government and the organizations, it's going to be a big black eye for the lottery company if bettors find out that the government is taking 70% or even 60%, now people in that region knows that the government is going to rob them if they win a lottery.
No one is going to support you. If you ask the common man out there in the street, he will respond that the government should deduct 90% of the winning as tax, and not 70%. In general, there is a lot of aversion to rich people. And that is the reason why governments always camouflage their tax increases to give an impression that they are targeting the rich (and in reality it is the middle class that is the worst hit).