Most sportsbooks don't void bets after a certain period of time, which could be as little as a day after the end of the match or event, or even less. What Coolbet is doing is actually the standard amongst sportsbooks, and in their rules they state: "In case a match is finished in normal format, has a final result and one team has been awarded a win after the match, all bets will stand."
Wildz does state in their rules that they reserve the right to void bets on fixed matches after the fact, you might think this is normal, but this is unstandard and just leaves it open for the sportsbook to pick and choose when it suits them (when voiding would save them money).
So neither of them are technically wrong according to their own stated rules.
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