What will happen in Betting section Bayern Munich vs Union Berlin?
will it refund or wait for match?
I believe Freebitco.in follows a logical approach when it comes to canceled matches. All bets placed on canceled matches are voided and refunded to the respective bettors.
Here's a quote from TheQuin from a few years ago, I think it still applies:
We prefer to use common sense rather than official rules that are inflexible. If a game gets rescheduled to be played in a short period of time we can hold the bets but in cases like this where it's likely to be a long time we'll void the bet and refund.