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.
South Africa is a country that is proud of its biodiversity and amazing intact nature. While land-based casinos are legal, online gambling in this country is illegal, except for the national lottery, and a few sports and horse racing betting sites. South African players are being prosecuted by law if caught playing on foreign websites.