The initial welcome bonus is a one-time bonus intended to reward you on your first deposit and welcome you to the site. However, you are not always required to accept the welcome bonus when signing up, and you can sometimes choose to accept it later. Most online bingo sites will always give you additional bonuses as a returning customer. They don't often give the welcome bonus twice. However, some sites may offer a first, second, and sometimes third deposit bonus, so make sure to read the details on each site before signing up.