The words 'gamble' and 'gambler' are not in scripture.
But, scripture condemns the love of money as the root of many evils, and requires us to love our neighbors as ourselves. We can reasonably intuit that while raffles, bingo, and poker night are not a problem, modern sports betting is a serious problem. It is not loving to encourage our fellow man to risk their prosperity so fecklessly, or to encourage the sportsball teams to be corrupt.
But, scripture condemns the love of money as the root of many evils, and requires us to love our neighbors as ourselves. We can reasonably intuit that while raffles, bingo, and poker night are not a problem, modern sports betting is a serious problem. It is not loving to encourage our fellow man to risk their prosperity so fecklessly, or to encourage the sportsball teams to be corrupt.