UPDATE: This apparently only applies to non-US bettors.

According to a Yahoo! news article:

At least one sports book has apparently decided to sidestep the controversy by refunding the losers their money in the form of a free play, according to NESN. Sportsbook.com took the unusual step because, as one company official put it, “I can’t stand winning unfairly so I am going to give the punters their money back.”