A London court on Monday cleared Cairns of perjury and perverting the course of justice after prosecutors failed to convince a jury of his guilt over the course of a nine-week trial.
New Zealand Herald journalist Dylan Cleaver, who originally broke the story that the ICC's anti-corruption unit was investigating Cairns, said the result was a triumph for the former all-rounder.
He said the treatment of witnesses such as current Black Caps skipper Brendon McCullum would have players questioning why they should come forward to report corruption.
"Nobody, that's who," he concluded, noting that players who cooperated with investigators had confidential testimony leaked, then had their characters assassinated by defence lawyers.
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Former England captain Mike Atherton, writing in The Times of London, echoed the sentiment.
"The verdict... Could impact upon the sport's fight against corruption, if, as a result, players think twice about whistleblowing and authorities long and hard about bringing cases to court," he wrote.
The allegations against him resurfaced in December 2013 when the International Cricket Council confirmed it was investigating match-fixing claims involving three former New Zealand internationals.
Cricket historian Gideon Haigh said the ICC anti-corruption unit already had a credibility problem before the Cairns case, citing the July acquittal of Indian paceman Shanthakumaran Sreesanth and two other players of spot-fixing.
Haigh said the case against Cairns was not helped by the fact that the prosecution's star witness, former Kiwi batsman Lou Vincent, was a confessed match-fixer with a life ban from cricket.
Mills said the case showed the police, not the ICC, needed to be in charge of investigating corruption.
"This is criminal activity," he told commercial radio.
"It's run by significant mafia groups around the world. We need experts fighting that and with the powers to fight that."
Radio New Zealand sports editor Stephen Hewson said the case had left Kiwi cricket's reputation "tarnished but not tattered".
"Having said that, whenever there are upset results or out of the ordinary performances at cricket matches, there's always that thought at the back of one's mind - is that genuine?" he said.