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.
There are many things the country of Portugal, home of the Tagus river, is known for, but it is most likely praised for its delicious wines. Those who might find themselves in Portugal may be interested in mobile online gambling. Now regulated, it is increasingly popular; the Portuguese populace now have safer options to gamble online.