This one screams 'one good turn deserves another.' For making a gesture of intent through deposit, casinos reciprocate by giving the player a deposit bonus. This is an extra bonus that they can use separately or alongside their deposit to play for real money within the house, meaning they have more to play with.
One of the smallest and the only land-locked countries in Europe, Luxembourg, does not have any specific laws when it comes to mobile online gambling. Online gambling is illegal in this country, but only for domestic gambling websites. Players are free to play on foreign websites, which helped the popularity of mobile online gambling.