This bonus is given on a player's first deposit or several initial deposits after signing up. It allows the player to bet with more than they have deposited in the house. This means that they can get a feel of the games, and perhaps win without using so much money.
Luxembourg is undoubtedly one of the smallest countries in Europe, but politically, it is more significant than its size, housing several EU institutions and several powerful banks. While gambling is illegal in Luxembourg, online casinos are in practice tolerated. Locals can safely play in international live online casinos without fear of sanctions.