Hey fellas, slaman29 tagged me so just chipping in.

My opinion in these situations is always the same - if a bookie takes the bet, they need to honor the bet.
They have many levers to pull - they can suspend markets, limit the bets, ban accounts.., it is their responsibility to protect themselves.

It's incredibly hard to prove match fixing, and I feel it's the wrong way to approach this case. Was Loris Karius bribed in the Champions League final then?
In amateur leagues all kind of bizarre things happen all the time, and yeah - fixed matches are surely more common. But if somebody's killing you with big bets in Finnish amateur leagues it's your job to find a way around it if you still want to offer these markets.

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Regarding the arbitration - it's my opinion that it needs to be a team of 3-5 people, not a single arbitrator.