For $400, I don't think that would put your life in danger unless you are living in a country where the poverty rate is high and that amount is so huge.
That amount in my country can be earn through their salary so even if you brag that amount, you'll not get harm.
Maybe around $10,000 or more, that would already put your life in danger.
Well I don't think the issue here is about putting your life in danger but instead making others feel awful about their own life. When you win big just keep it to yourself and enjoy your gain then bragging about it to others, it can cause depression then lead to suicide. Making others feel bad about themselves when you achieve something big in your life shouldn't be a way of life instead be more supportive and give more to charity.