William Hill sent notices to Swiss customers last week where they said that they were leaving the market and voiding bets that had already been placed.
The UK company said that they were pulling out and no longer accepting Swiss bets as of mid-day on June 28th. The operator cited "regulatory reasons" as the decision to leave, but didn't elaborate. It is speculated that the group voided about 400 bets because of the decision.
Switzerland launched their regulated online betting market on July 1st, and it's possible that William Hill is trying to play nice for the chance to enter the market at a later date.
We don't have the exact email, but we'll update readers as we learn more.