Live betting A I

Does the sportsbooks know who's going to win before they actually win during live betting ? I have seen in the NBA as well as other sports NFL college bb where a team pre game would start out as a moneyline favorite but would start losing but significant points and the same team still be a moneyline favorite. It's almost as if the sportsbooks know if a certain team is gonna win. I have hit a win once in a Ohio state college football game where they actually trailed significantly and still won the game but it doesn't happen very often for a comeback opportunity.