Of course, it can! The only caveat is that keno might not always carry a 1 to 1 wagering contribution for your bonus. That means that in some cases, playing keno with your bonus will make it a bit tougher to meet your playthrough requirement for said bonus. So, the number of bets you have to make will be higher than say, playing slots. You can always keep an eye out for a specific keno bonus that some online casinos offer.