A reload bonus is earned by sending subsequent (after the first) money into a player's betting account. The bonus is meant to encourage players to keep topping up the money they have in their account. Its main advantage is that it allows the player to enjoy the same benefits new players get.
For those who are looking for a diver's paradise then they are looking for the Cayman Islands. This is a region that was known for its prohibition of all forms of gambling. Recently there has been some talk about changing this which would open up opportunities for mobile online gambling for residents.