This is a quid pro quo bonus; scratch my back I scratch yours. Players receive this after putting some money in their account. The more the money deposited, the higher the bonus. At the end of the day, therefore, the player is the winner because they get to play with more than their capital investment.
Bolivia is a country in South America. One of its notable tourist attractions is the Salar de Uyuni, which is the largest salt flat in the world. Bolivians enjoy gambling, primarily online. There are no local registered mobile online sites, and so locals make use of international platforms whenever they are in the mood for some gambling.