You have to love Bingo and games of chance to enjoy Bingo Cash. It does pay real money, but you shouldn't look at online Bingo as a way to bring in regular income. At best, it's a fun, casual hobby that can sometimes pay you money for winning.
Yes, Bingo Cash is a legitimate app where you can play bingo to win real money. It is free to download, however, you do have to put down a cash deposit to enter a tournament where you can play others for a chance to win up to $3,000.