A group of people are spreading news that Binance Dex has launched and they are holding a giveaway.
There has been plenty of them in the past as well. It's not a new scam but the back story keeps changing.
Make sure that whenever you see claims of a giveaway, you verify this with some sort of official from the website that is apparently offering it. These giveaway scams have gotten so bad in the past on Twitter that CZ had to change his name to something along the lines of "not giving away coins".
Use your common sense here.
Why would an exchange ask you to deposit any sum of money if they were actually running a giveaway to promote themselves, especially with such high returns on your deposit? Most of them don't even have the appropriate licenses to do this, since this pretty much constitutes an investment.